Method and system for determining power of intraocular lens to be inserted
AssigneeSchool Juridical Person Kitasato Institute
InventorShuntaro TSUNEHIRO
Life of this patent
Estimating the term…
Abstract
The present invention accurately predicts postoperative intraocular lens position on the basis of a shape image of the crystalline lens obtained by an optical interference tomographic imaging device. This makes it possible to reduce the postoperative refractive error and determine the power of the intraocular lens. The present invention comprises: a step for finding by computer the equatorial position, which is the site of maximum diameter in the crystalline lens, from the morphology of the crystalline lens obtained from a tomographic image of the patients eye generated by the optical interference tomographic imaging device; and a step for estimating the position of the intraocular lens from the equatorial position thus found.
Claims12
A method for determining the power of intraocular lens to be inserted using a tomographic image of an anterior ocular segment generated by a tomographic imaging apparatus, the method comprising:
- determining, by means of a computer, equator positions of a crystalline lens which correspond to the maximum diameter portion of the crystalline lens based on a morphology of the crystalline lens obtained from a tomographic image of the anterior ocular segment of a patient's eye generated by the tomographic imaging apparatus;
- estimating, by means of the computer, a distance from an anterior surface of a cornea, of an intraocular lens to be inserted, based on the determined equator positions, the anterior capsule position of the crystal lens and the posterior position of the crystal lens;
- and
- determining, by means of the computer, the power of the intraocular lens, correspondingly to the estimated distance from the anterior surface of a cornea, of the intraocular lens to be inserted.
A method for determining the power of intraocular lens to be inserted using a tomographic image of an anterior ocular segment generated by a tomographic imaging apparatus, the method comprising:
- displaying, by means of a computer, a tomographic image of an anterior ocular segment of a patient's eye generated by the tomographic imaging apparatus, on a display apparatus;
- and
- determining, by means of the computer, as equator positions, positions input as intersecting points between extensions of locus curves of an anterior capsule and of a posterior capsule on the tomographic image of the patient's eye displayed on the display apparatus, the positions being input by an input unit in an instructive manner;
- estimating, by means of the computer, a distance from an anterior surface of a cornea, of an intraocular lens to be inserted, based on the determined equator positions, the anterior capsule position of the crystal lens and the posterior position of the crystal lens;
- and
- determining, by means of the computer, the power of the intraocular lens, correspondingly to the estimated distance from the anterior surface of a cornea, of the intraocular lens to be inserted.
A system for determining the power of intraocular lens to be inserted using a tomographic image of an anterior ocular segment generated by a tomographic imaging apparatus, the system comprising:
- a tomographic imaging apparatus configured to generate a tomographic image of a patient's eye;
- a unit configured to determine equator positions of a crystalline lens which correspond to a maximum diameter portion based on a morphology of the crystalline lens obtained from the tomographic image of the patient's eye generated by the tomographic imaging apparatus;
- and
- a unit configured to estimate a distance from an anterior surface of a cornea, of an intraocular lens to be inserted, based on the determined equator positions, the anterior capsule position of the crystal lens and the posterior position of the crystal lens;
- and
- a unit configure to determine the power of the intraocular lens, correspondingly to the estimated distance from the anterior surface of a cornea, of the intraocular lens to be inserted.
A system for determining the power of a postoperative intraocular lens comprising:
- a tomographic imaging apparatus for configured to generate a tomographic image of an anterior ocular lens of a patients eye;
- a display apparatus configured to display the tomographic image of the anterior ocular lens of the patient's eye generated by the tomographic imaging apparatus;
- an input unit configured to enable intersecting points between extensions of locus curves of an anterior capsule and of a posterior capsule to be input in an instructive manner on the tomographic image of the patient's eye displayed on the display apparatus;
- a determining unit configured to determine, as equator positions, the intersecting points between the extensions of the locus curves of the anterior capsule and of the posterior capsule input by the input unit;
- and
- a unit configured to estimate, by means of the computer, a distance from an anterior surface of a cornea, of an intraocular lens to be inserted, based on the determined equator positions, the anterior capsule position of the crystal lens and the posterior position of the crystal lens;
- a determination unit configured to determine the power of the intraocular lens, correspondingly to the estimated distance from the anterior surface of a cornea, of the intraocular lens to be inserted.
Dependencies are inferred from the claim text.