Apparatus for ophthalmological surgery

Apparatus for performing ophthalmological surgery to reduce as ascertained astigmatic condition by selective ablation of the anterior surface of the cornea with penetration into the stroma to achieve a volumetric removal of corneal tissue, said apparatus comprising laser means having a chassis and producing an output beam in the ultraviolet portion of the electromagnetic spectrum and characterized by a spot which at eye impingement is small in relation to the cornea to be operated upon, said laser means including means for adjusting beam-exposure flux to a level at which corneal-tissue ablation per unti time is to an ascertained elemental depth which is but a fraction of desired maximum depth into the stroma region, scan-deflection means positioned for deflection of said beam in a limited field about a central axis, means for steadying the cornea with respect to said chassis and with the central area of the cornea centered on the central axis of scan deflection of said beam, said scan-deflection means having two coordinates of deflection for area coverage within the perimeter of said limited field, and means including a microprocessor for coordinating the operation of said scan-deflection means in a controlled program of area coverage to establish greatest cumulative beam exposure along the alignment of the central axis of symmetry of the ascertained astigmatic condition, with cumulative beam exposure decreasing smoothly as a function of increasing lateral offset on both sides of said central axis of symmetry.

Apparatus for performing ophthalmological surgery to reduce an ascertained astigmatic condition by selective ablation of the anterior surface of the cornea with penetration into the stroma to achieve a volumetric removal of corneal tissue, said apparatus comprising laser means having a chassis and producing an output beam in the ultraviolet portion of the electromagnetic spectrum and characterized by a spot which at eye impingement is small, in relation to the cornea to be operated upon, said laser means including means for adjusting beam-exposure flux to a level at which corneal-tissue ablation per unit time is to an ascertained elemental depth which is but a fraction of desired maximum depth into the stroma region, scan-deflection means positioned for deflection of said beam in a limited field about a central axis, means for steadying the cornea with respect to said chassis and with the central area of the cornea centered on the central axis of scan deflection of said beam, said scan-deflection means having two coordinates of deflection for area coverage within the perimeter of said limited field, and control means for coordinating the operation of said scan-deflection means in a controlled program of area coverage to establish greatest cumulative beam exposure along the alignment of the central axis of symmetry of the ascertained astigmatic condition, with cumulative beam exposure decreasing smoothly as a function of increasing lateral offset on both sides of said central axis of symmetry.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve a cylindrical astigmatism-reducing anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a pulsed laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the eye with an intensity to produce tissue penetration to a depth per pulsed exposure which is but a fraction of said predetermined maximum;
• said means including means for selectively first determining and controlling a first rectangular area of exposure to the extent of at least said fractional depth and thereafter determining and controlling a second and different rectangular area of exposure to the extent of at least said fractional depth, each of said rectangular areas being symmetrically disposed on opposite sides of one and the same meridian of the cornea and within the optically functioning area of the cornea, wherein said meridian is selectable for orientation related to the axis of astigmatism to be reduced, and wherein the width of said rectangular area varies from one to the next rectangular area;
• whereby the cumulative penetration of the cornea for both said areas effects an astigmatism-correcting change in the curvature of the cornea.

Apparatus for perfoming ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve a cylindrical astigmatism-reducing anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the eye with an intensity to produce tissue penetration to a depth per unit time exposure which is but a fraction of said predetermined maximum;
• said means including means for selectively first determining and controlling a first rectangular area of exposure to the extent of at least said fractional depth and thereafter determining and controlling a second and different rectangular area of exposure to the extent of at least said fractional depth, each said rectangular areas being symmetrically disposed on opposite sides of one and the same meridian of the cornea within the optically functioning area of the cornea, wherein said meridian is selectable for orientation related to the axis of astigmatism to be reduced, and wherein the width of said rectangular area varies from one to the next rectangular area;
• whereby the cumulative penetration of the cornea for both said areas effects an astigmatism-correcting change in the curvature of the cornea.

Apparatus for performing ophthalmological surgery to reduce an ascertained astigmatic condition by selective ablation of the anterior surface of the cornea with penetration into the stroma to achieve a volumetric removal of corneal tissue, said apparatus comprising laser means having a chassis and producing an output beam in the ultraviolet portion of the electromagnetic spectrum and characterized by a spot which at eye impingement is small in relation to the cornea to be operated upon, said laser means including means for adjusting beam-exposure flux to a level at which corneal-tissue ablation per unit time is to an ascertained elemental depth which is but a fraction of desired maximum depth into the stroma region, scan-deflection means positioned for deflection of said beam in a limited field about a central axis, means for steadying the cornea with respect to said chassis and with the central area of the cornea centered on the central axis of scan deflection of said beam, said scan-deflection means having X-Y coordinates of deflection for area coverage at least within the perimeter of said limited field, adjustable means for angular selection of the orientation of said coordinates to position one to the exclusion of the other of said coordinates in oriented relation to the ascertained astigmatism axis of the cornea to be operated upon, and control means with coordinating control connections to said scan-deflection means and to said laser for establishing a series of different centrally related perimeter limits of generally rectangular-area scan within the perimeter of said limited field and for coordinating the operation of said scan-deflection means in a controlled program of limitation of one area scan within one perimeter limit before repeating such coordination within the next-successive perimeter limit in the series, the successively scanned areas being of varying width and symmetrical about a central axis aligned with said astigmatism axis, whereby ablative penetration to said maximum depth is the cumulative result of plural area scans of each of a succession of different but overlapping rectangular areas, with astigmatism-reducing cornea-curvature correction.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with penetration into the stroma to achieve a volumetric removal of corneal tissue, said apparatus comprising laser means having a chassis and producing an output beam in the ultraviolet portion of the electromagnetic spectrum and characterized by a spot which at cornea impingement is small in relation to the cornea to be operated upon, said laser means including means for adjusting beam-exposure flux to a level at which resultant corneal-tissue ablation per unit time is to an ascertained elemental depth which is but a fraction of the desired maximum depth of ablation into the stroma region, scan-deflection means positioned for deflection of said beam in a limited field about a central axis, means for steadying the cornea with respect to said chassis and with the central area of the cornea centered on the central axis of scan deflection of said beam, said scan-deflection means having two coordinates of deflection for area coverage within the perimeter of said central area, and means including a microprocessor for establishing a series of different centrally related perimeter limits of area-scan action within the perimeter of said central area and for coordinating the operation of said scan-deflection means in a controlled program of limitation of one area scan within one perimeter limit before repeating such coordination within the next-successive perimeter limit in the series, whereby ablative penetration to said maximum depth is the cumulative result of plural area scans of each of a succession of different but overlapping areas.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with penetration into the stroma to achieve a volumetric removal of corneal tissue, said apparatus comprising laser means having a chassis and producing an output beam in the ultraviolet portion of the electromagnetic spectrum and characterized by a relatively small spot at cornea impingement, said laser including means for adjusting beam-exposure flux to a level at which resultant corneal-tissue ablation per unit time is to an ascertained elemental depth which is but a fraction of desired maximum depth of ablation into the stroma region of the cornea, scan-deflection means positioned for deflection of said beam in a limited field about a central axis, means for steadying the cornea with respect to said chassis and with the central area of the cornea centered on the central axis of scan deflection of said beam, said scan-deflection means having two coordinates of deflection for area coverage within the perimeter of said central area, and means including a microprocessor for coordinating the operation of said scan-deflection means in a controlled program of concentric-circle coverage to establish greatest cumulative beam exposure of a least-radius circular area and least cumulative beam exposure of a greatest-radius circular area, whereby to effect a myopia-correcting curvature change in the external surface of the cornea.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with penetration into the stroma to achieve a volumetric removal of corneal tissue, said apparatus comprising laser means having a chassis and producing an output beam in the ultraviolet portion of the electromagnetic spectrum and characterized by a relatively small spot at cornea impingement, said laser including means for adjusting beam-exposure flux to a level at which resultant corneal-tissue ablation per unit time is to an ascertained elemental depth which is but a fraction of desired maximum depth of ablation into the stroma region of the cornea, scan-deflection means positioned for deflection of said beam in a limited field about a central axis, means for steadying the cornea with respect to said chassis and with the central area of the cornea centered on the central axis of scan deflection of said beam, said scan-deflection means having two coordinates of deflection for area coverage within the perimeter of said central area, and means including a microprocessor for coordinating the operation of said scan-deflection means in a controlled program of concentric-circle coverage to establish greatest cumulative beam exposure of a greatest-radius circular area and least cumulative beam exposure of a least-radius circular area, whereby to effect a hyperopia-correcting curvature change in the external surface of the cornea.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with penetration into the stroma to achieve a volumetric removal of corneal tissue, said apparatus comprising laser means producing an output beam in the ultraviolet portion of the electromagnetic spectrum and characterized by a spot which at cornea impingement is small in relation to the cornea to be operated upon, said laser means including means for adjusting beam-exposure flux to a level at which resultant corneal-tissue ablation per unit time is to an ascertained elemental depth which is but a fraction of a predetermined maximum depth of ablation into the stroma, scan-deflection means positioned for deflection of said beam in a limited field about a central axis, said scan-deflection means having two coordinates of deflection for area coverage within the perimeter of said limited field, and control means with coordinating control connections to said scan-deflection means and to said laser for varying the perimeter of successive area scans within said field wherein said area scans are symmetrical about the central axis, whereby said scan-deflection means may perform one area scan within one perimeter limit before performing another area scan within another perimeter limit, whereby to effect a controlled sculpturing action upon the cornea to alter the optical properties thereof.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with penetration into the stroma to achieve a volumetric removal of corneal tissue, said apparatus comprising laser means producing an output beam in the ultraviolet portion of the electromagnetic spectrum and characterized by a spot which at cornea impingement is small in relation to the cornea to be operated upon, said laser means including means for adjusting beam-exposure flux to a level at which resultant corneal-tissue ablation per unit time is to an ascertained elemental depth which is but a fraction of a predetermined maximum depth of ablation into the stroma, scan-deflection means positioned for deflection of said beam in a limited circular field of maximum radius about a central axis, said scan-deflection means having two coordinates of deflection for area coverage within the circumference of said circular field, and control means with control connections to said scan-deflection means and to said laser for varying between a minimum and substantially said maximum the inner radius of an annular area having its outer radius at said maximum, said inner radius variation being from one to another annular-area scan, whereby successive area scans may be annular and with different inner radii about the central axis, whereby to effect a controlled sculpturing action upon the cornea to effect a hyperopia-reducing alteration of the optical properties thereof.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a pulsed laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per pulsed exposure which is but a fraction of said predetermined maximum;
• said means including means for selectively (a) determining and controlling one circular area of exposure to the extent of at least said fractional depth and (b) determining and controlling a different circular area of exposure to the extent of at least said fractional depth, each of said circular areas being within the optically functioning area of the cornea and concentrically disposed with respect to the optical axis of the cornea;
• whereby the cumulative penetration of the cornea for both said areas of exposure can effect a myopia-reducing corrective change in the curvature of the cornea.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per unit time exposure which is but a fraction of said predetermined maximum;
• said means including means for selectively (a) determining and controlling one circular area of exposure to the extent of at least said fractional depth and (b) determining and controlling a different circular area of exposure to the extent of at least said fractional depth, each of said circular areas being within the optically functioning area of the cornea and concentrically disposed with respect to the optical axis of the cornea;
• whereby the cumulative penetration of the cornea for both said areas of exposure can effect a myopia-reducing corrective change in the curvature of the cornea.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a pulsed laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per pulsed exposure which is but a fraction of said predetermined maximum;
• said means including means for selectively (a) determining and controlling one circularly annular area of exposure to the extent of at least said fractional depth and (b) determining and controlling a different circularly annular area of exposure to the extent of at least said fractional depth, each of said circularly annular areas being within the optically functioning circular area of the cornea and concentrically disposed with respect to the optical axis of the cornea;
• said areas having overlapping relation at least to the outer diameter of the optically functioning area, and one of said annular areas having a lesser inner diameter than the other of said annular areas;
• whereby the cumulative penetration of the cornea for both said annular areas of exposure can effect a hyperopia-reducing corrective change in the curvature of the cornea.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a laser beam in the ultraviolet region of the electromagnetic specturm;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per unit time exposure which is but a fraction of said predetermined maximum;
• said means including means for selectively (a) determining and controlling one circularly annular area of exposure to the extent of at least said fractional depth and (b) determining and controlling a different circularly annular area of exposure to the extent of at least said fractional depth, each of said circularly annular areas being within the optically functioning circular area of the cornea and concentrically disposed with respect to the optical axis of the cornea, said areas having overlapping relation at least to the outer diameter of the optically functioning area, and one of said annular areas having a lesser inner diameter than the other of said annular areas;
• whereby the cumulative penetration of the cornea for both said areas can effect a hyperopia-reducing corrective change in the curvature of the cornea.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a pulsed laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per pulsed exposure which is but a fraction of said predetermined maximum;
• said means including control means for selectively determining and controlling one corneal area of laser-beam exposure to the extent of at least said fractional depth (a) in one or more adjacent concentrically related annular zones within the optically functioning area of the cornea and (b) in the central circular zonal area adjacent and within the innermost annular zonal area, said innermost annular area having an outer circular perimeter which is of incrementally larger radius than that of its inner circular perimeter, and the radius of said inner circular perimeter being substantially the radius of the perimeter of said circular zonal area;
• said control means further selectively determining and controlling other corneal areas of laser-beam exposure to the extent of at least said fractional depth wherein for the innermost annular zonal area the outer-perimeter radius varies and the inner-perimeter radius is constant, and wherein for the central circular zonal area the outer-perimeter radius varies;
• whereby the cumulative corneal penetration of the cornea for both said corneal-area exposures can effect a Fresnel-characterized myopia-reducing corrective change in the curvature of the cornea.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per unit time exposure which is but a fraction of said predetermined maximum;
• said means including control means for selectively determining and controlling one corneal area of laser-beam exposure to the extent of at least said fractional depth (a) in one or more adjacent concentrically related annular zones within the optically functioning area of the cornea and (b) in the central circular zonal area adjacent and within the innermost annular zonal area, said innermost annular area having an outer circular perimeter which is of incrementally larger radius than that of its inner circular perimeter, and the radius of said inner circular perimeter being substantially the radius of the perimeter of said circular zonal area;
• said control means further selectively determining and controlling other corneal areas of laser-beam exposure to the extent of at least said fractional depth wherein for the innermost annular zonal area the outer-perimeter radius varies and the inner-perimeter radius is constant, and wherein for the central circular zonal area the outer-perimeter radius varies;
• whereby the cumulative corneal penetration of the cornea for both said corneal-area exposures can effect a Fresnel-characterized myopia-reducing corrective change in the curvature of the cornea.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a pulsed laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per pulsed exposure which is but a fraction of said predetermined maximum;
• said means including control means for selectively determining and controlling one corneal area of laser-beam exposure to the extent of at least said fractional depth (a) in one or more adjacent concentrically related annular zones within the optically functioning area of the cornea and (b) in the central circular zonal area adjacent and within the innermost annular zonal area, said innermost annular area having an outer circular perimeter which is of incrementally larger radius than that of its inner circular perimeter, and the radius of said inner circular perimeter being substantially the radius of the perimeter of said circular zonal area;
• said control means further selectively determining and controlling other corneal areas of laser-beam exposure to the extent of at least said fractional depth wherein for the innermost annular zonal area the outer-perimeter radius is constant and the inner-perimeter radius varies, and wherein for the central circular zonal area the outer-perimeter radius is constant and the inner-perimeter radius varies;
• whereby the cumulative corneal penetration of the cornea for both said cornea-area exposures can effect a Fresnel-characterized hyperopia-reducing corrective change in the curvature of the cornea.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per unit time exposure which is but a fraction of said predetermined maximum;
• said means including control means for selectively determining and controlling one corneal area of laser-beam exposure to the extent of at least said fractional depth (a) in one or more adjacent concentrically related annular zones within the optically functioning area of the cornea and (b) in the central circular zonal area adjacent and within the innermost annular zonal area, said innermost annular area having an outer circular perimeter which is of incrementally larger radius than that of its inner circular perimeter, and the radius of said inner circular perimeter being substantially the radius of the perimeter of said circular zonal area;
• said control means further selectively determining and controlling other corneal areas of laser-beam exposure to the extent of at least said fractional depth wherein for the innermost annular zonal area the outer-perimeter radius is constant and the inner-perimeter radius varies, and wherein for the central circular zonal area the outer-perimeter radius is constant and the inner-perimeter radius varies;
• whereby the cumulative corneal penetration of the cornea for both said cornea-area exposures can effect a Fresnel-characterized hyperopia-reducing corrective change in the curvature of the cornea.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a pulsed laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per pulsed exposure which is but a fraction of said predetermined maximum;
• said means including means for selectively determining and controlling a circular area of exposure to the extent of at least said fractional depth and thereafter determining and controlling one or more further like and coaxially related circular areas of exposure to the extent of at least said fractional depth, each of said areas including the optically functioning area of the cornea;
• whereby the cumulative penetration of the cornea for said corneal-area exposures will prepare a circular corneal recess of constant depth for reception of a corneal transplant.

Apparatus for performing ophthalmological surgery by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per unit time exposure which is but a fraction of said predetermined maximum;
• said means including means for selectively determining and controlling a circular area of exposure to the extent of at least said fractional depth and thereafter determining and controlling one or more further like and coaxially related circular areas of exposure to the extent of at least said fractional depth, each of said areas including the optically functioning area of the cornea;
• whereby the cumulative penetration of the cornea for said corneal-area exposures will prepare a circular corneal recess of constant depth for reception of a corneal transplant.

Apparatus for performing ophthalmological surgery to reduce an ascertained astigmatic condition by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a pulsed laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per pulsed exposure which is but a fraction of said predetermined maximum;
• said means including means for selectively (a) determining and controlling one rectangular area of exposure to the extent of at least said fractional depth and (b) determining and controlling a different rectangular area of exposure to the extent of at least said fractional depth, said rectangular areas being of varying width and symmetrical about a central axis through the optical axis of the cornea and oriented in accordance with the ascertained astigmatic condition;
• whereby the cumulative penetration of the cornea for both said areas of exposure can effect an astigmatism-reducing corrective change in the curvature of the cornea.

Apparatus for performing ophthalmological surgery to reduce an ascertained astigmatic condition by selective ablation of the anterior surface of the cornea with varied penetration up to a predetermined maximum penetration into the stroma to achieve an anterior-curvature change by volumetric removal of tissue within the optically functioning area of the cornea, said apparatus comprising:

• a laser producing a laser beam in the ultraviolet region of the electromagnetic spectrum;
• means for shaping, focusing and directing the beam toward the cornea with an intensity to produce tissue penetration to a depth per unit time exposure which is but a fraction of said predetermined maximum;
• said means including means for selectively (a) determining and controlling one rectangular area of exposure to the extent of at least said fractional depth and (b) determining and controlling a different rectangular area of exposure to the extent of at least said fractional depth, said rectangular areas being of varying width and symmetrical about a central axis through the optical axis of the cornea and oriented in accordance with the ascertained astigmatic condition;
• whereby the cumulative penetration of the cornea for both said areas of exposure can effect an astigmatism-reducing corrective change in the curvature of the cornea.