Patient-interactive method and apparatus for measuring eye refraction
First Claim
1. A patient-interactive apparatus for measuring refraction of an eye comprisingmeans for selectively directing at least two spaced-apart narrow beams of light into the eye, said beams simulating light traveling from a point source and positioned and angularly oriented such that the beams would impinge on the retina of the eye at a single point if the eye were properly refracting but would impinge on the retina at two different points if the eye were not properly refracting,means for selectively adjusting the spacing and/or angular orientation between the beams of light to cause the beams to impinge on the retina of the eye at a single point, andmeans for determining the amount of adjustment made to the spacing and/or angular orientation between the light beams.
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Accused Products
Abstract
A patient-interactive method and apparatus for measuring eye refraction includes a display for producing, alternately, two spaced-apart light spots, and an aperture device for passing light from one spot through an aperture in one position, to travel to the eye, and for passing light from the other spot through an aperture in a second position, to travel to the eye. If the patient sees a single spot, the eye is properly refracting, but if he/she sees two spots, the eye is not properly refracting. Apparatus is provided to allow the patient to adjust the spacing of the light spots, and thus the angle that light enters the eye, until the patient views a single light spot. The amount of adjustment of the spacing of light spots is measured to thereby provide a measure of diopter correction necessary to correct the refraction error.
19 Citations
18 Claims
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1. A patient-interactive apparatus for measuring refraction of an eye comprising
means for selectively directing at least two spaced-apart narrow beams of light into the eye, said beams simulating light traveling from a point source and positioned and angularly oriented such that the beams would impinge on the retina of the eye at a single point if the eye were properly refracting but would impinge on the retina at two different points if the eye were not properly refracting, means for selectively adjusting the spacing and/or angular orientation between the beams of light to cause the beams to impinge on the retina of the eye at a single point, and means for determining the amount of adjustment made to the spacing and/or angular orientation between the light beams.
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12. A patient-interactive apparatus for measuring refraction of an eye, comprising:
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means for emitting light forwardly from a first location and a second location, the second location being spaced laterally from the first location; shield means disposed forwardly from the light emitting means for selectively blocking light from the light emitting means, and including first and second pinhole aperture means for selectively allowing light from the first location of the light emitting means to pass through the shielding means at the first aperture means to the eye, and light from the second location of the light emitting means to pass through the shielding means at the second aperture means, to the eye; and manual control means for selectively varying the angle of light traveling between the first location of the light emitting means and the first aperture means, and between the second location of the light emitting means and the second aperture means. - View Dependent Claims (13, 14, 15)
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16. A patient-interactive method for measuring refraction of an eye comprising:
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selectively directing at least two spaced-apart narrow beams of light into the eye, said beams simulating light traveling from a point source and positioned and angularly oriented such that the beams would impinge on the retina of the eye at a single point if the eye were properly refracting but would impinge on the retina at two different points if the eye were not properly refracting; selectively adjusting the spacing and/or angular orientation between the beams of light to cause the beams of light to impinge on the retina of the eye at a single point; and determining the amount of adjustment made to the spacing and/or angular orientation between the light beams. - View Dependent Claims (17, 18)
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Specification