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US 8,136,946 B2Granted
Apparatus for determining prescription for prism lenses for diplopic patients
OwnerRoger Glenn Reedinventor
Life of this patent
Estimating the term…
Abstract
An apparatus is provided for finding and defining a prescription for prism glasses for Diplopic patients and AMD patients whose Macula and Fovea are damaged enough that the patients have double vision, but, still have relatively good acuity. The apparatus positions lenses in infinitely variable locations horizontally and vertically in front of the patient's eyes until the patient indicates that he/she sees the two images fuse. The H-V coordinates of the location of the Optic center of each lens axis in relation to the patient's visual axis are decentration dimensions indicated for each eye by the H and V dials on the apparatus and are thus the basis for an accurate prescription for prism lenses.
Claims6
An apparatus comprising:
- an infinitely variable graduated horizontal control that moves a pair of lens holders slowly in front of a patients eyes equal distances but opposite directions and, independently from the horizontal control, an infinitely variable graduated vertical control that slowly moves the lens holders in front of the patients eyes equal distances but opposite directions;
- wherein the apparatus finds and defines, for Diplopic and AMD patients who have double vision, a location of each axis of a pair of spherical lens-blanks (of appropriate diopter) relative to a visual-axis of each respective eye of the patient, whereat each respective lens-axis is offset from the visual-axis of each respective eye by an infinitely variable graduated horizontal control that slowly moves the lens blanks equal distances but opposite directions (H-coordinates) in front of the patient's eyes and by an infinitely variable graduated vertical control that slowly moves the lens blanks equal distances but opposite directions (V-coordinates) in front of the patient's eyes that causes a required induced prism that in turn causes the patient viewing through the lens-blanks to see single vision;
- the H-V coordinates, combined with the diopter, become a required Rx that is converted by the user instructions to BI, BO, BU, BD notation;
- and a pair of spherical stationary-lenses of appropriate minus diopter are added, in the case of a patient whose eyes require such for near or far focusing, to be used in combination with the prism lenses so that the total magnification is compatible with the patient's eyes.
1 more element
An apparatus for finding and defining an Rx for eyeglass prism lenses for Diplopic and AMD patients who have double vision comprising:
- two complete sets of centered spherical lens-blanks (sized to fit lens-holders) for use in conjunction with the apparatus, comprising a complete range of plus (+) and minus (−) diopters, each of which are centered lenses with a segment removed to prevent interference when the lenses are moved toward each other;
- two complete sets of decentered lens-blanks (one set sized for each lens holder), for use in conjunction with the apparatus comprising a complete range of plus (+) and minus (−) diopters for each of at least three sub-sets of decentered lenses of varying degrees of decentration up to and a maximum of 70 mm of decentration;
- a black-identifying-index at the intersection of the center-line and the base of each decentered lens;
- a green-identifying-index on the center-line at the edge opposite the base of each decentered lens;
- two complete sets of spherical stationary-lens-blanks (edged to fit stationary-lens-holders) comprising a complete range of centered minus (−) diopter lenses for use in conjunction with the apparatus;
- a means for steadying the apparatus in relation to the patient's eyes;
- a means for facilitating the calculation of a prism Rx based upon the radial orientation of a decentered lens within a lens-holder;
- a means for holding and positioning a pair of lens-blanks, having correct diopters for the patient, so that the center of each respective lens-holder is offset from a visual-axis of each respective eye by a horizontal and a vertical decentration (H-V coordinates) that causes a required induced prism that in turn causes the double images that the patient sees to fuse;
- a means for holding a pair of stationary-lens-blanks so that the lenses' visual axes coincide with the axes of the patient's eyes that require a second spherical lens of an appropriate minus (−) diopter to accomplish a desired total magnification effect for near or far focusing when combined with the magnification/induced prism of the lens-blanks;
- a means for indicating in centimeters the H-V coordinates of the center of each respective lens-holder in relation to the axis of each respective patient's eye;
- a means for zeroing the apparatus at a point of horizontal movement of the lens-holders whereat a spacing of the centers of the lens-holders matches a PD of the patient's eyes;
- the means for steadying the apparatus in relation to the patient's eyes includes a forehead-rest constructed of a vinyl covered molded soft spongy material positioned and fixedly attached to the patient's side of the apparatus to press against the patient's forehead when the eyes' axes align with the centers of a pair of crosshairs;
- the means for facilitating the calculation of a prism Rx based upon the radial orientation of decentered lenses within the lens-holders, the means comprising:
- radial indexes with numbers ranging from 0 to 360 degrees, in 30 degree increments, on the Doctor's side of the lens holders where the numbers on the OD lens holder from 0 to 090 and 270 to 360 degrees are in one color and from 090 to 270 are in a second color but sharing the same indexes that are in a third color, in which the appropriate decentered lens is rotated to the angle that best suits the patient;
- radial indexes on the OS lens holder where the numbers from 090 to 270 are in one color and from 270 to 360 and from 0 to 090 are in a second color but sharing the same indexes that are in a third color, in which the appropriate decentered lens is rotated to the angle that best suits the patient, after the aforementioned rotation of both lenses, further fine tuning is accomplished by manual rotation of the horizontal and vertical adjustment knobs;
- and calculations based on the BU, BD, BI, BO notation derived from the H-V coordinates and, using equations known to those skilled in the art, mathematically combine BU, BD, BI and BO with the induced prism created by the decentration of the lenses plus the effect of the rotation of the decentered lenses, to arrive at a prism lens Rx expressed in 360.
13 more elements
Dependencies are inferred from the claim text.