Method and apparatus for measuring visual function
First Claim
1. An apparatus for measuring a visual function by measuring a threshold of contrast of a striped target whose swing can be recognized visually by a person under examination, said apparatus comprising:
- a screen having a virtually uniform brightness;
striped target forming means for forming the striped target on said screen;
contrast varying means for varying a contrast of the striped target; and
striped target oscillating means for oscillating the striped target without inducing movement of an eye of the person under examination in a direction virtually orthogonal to a stripe pattern on the striped target.
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Accused Products
Abstract
The inventive method and apparatus are based on the display of a striped target with constantly accurate contrast to the patient for finding a visual function disturbance associated with such eye diseases as glaucoma or diabetic repinopathy at their earlier stage. A sight target of striped pattern is formed on the screen having a uniform brightness, the striped target is oscillated in the direction orthogonal to the striped pattern while varying the contrast of striped target and showing it to the patient, and the threshold of the pattern contrast which can be recognized visually by the patient is measured.
24 Citations
20 Claims
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1. An apparatus for measuring a visual function by measuring a threshold of contrast of a striped target whose swing can be recognized visually by a person under examination, said apparatus comprising:
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a screen having a virtually uniform brightness; striped target forming means for forming the striped target on said screen; contrast varying means for varying a contrast of the striped target; and striped target oscillating means for oscillating the striped target without inducing movement of an eye of the person under examination in a direction virtually orthogonal to a stripe pattern on the striped target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of measuring a visual function by measuring a threshold of a contrast of a striped target whose swing can be recognized visually by a person under examination, said method comprising the steps of:
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maintaining a virtually uniform brightness of a screen; forming the striped target on said screen; varying a contrast of the striped target; oscillating the striped target without inducing movement of an eye of the person under examination in a direction virtually orthogonal to a stripe pattern of the striped target; letting the person under examination recognize visually the striped target; and evaluating the threshold of contrast of the striped target based on a response of visual recognition made by the person. - View Dependent Claims (18)
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19. An apparatus for measuring a visual function by measuring a threshold of a contrast of a striped target whose swing is recognized visually by a person under examination, said apparatus comprising:
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a screen having a virtually uniform brightness; means for forming the striped target on said screen; means for varying the contrast of the striped target; and means for oscillating the striped target with a speed which an eye of the person under examination follows in a direction virtually orthogonal to a stripe pattern of the striped target.
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20. An apparatus for measuring a visual function by measuring a threshold of a contrast of a striped target whose swing is recognized visually by a person under examination, said apparatus comprising:
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a screen having a virtually uniform brightness; means for forming the striped target on said screen; means for varying the contrast of the striped target; and means for oscillating the striped target with a frequency which an eye of the person under examination follows in a direction virtually orthogonal to a stripe pattern of the striped target.
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Specification