Apparatus and methods for testing contrast sensitivity
AssigneeThe Ohio State University Research Foundation
InventorsAngela M. Brown, Delwin T. Lindsey
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Abstract
A test for measuring the contrast sensitivity of a patient uses a set of card that each include a stimulus, such as a square wave grating, presented at a single low-spatial frequency. The gratings vary in contrast from card to card. The test allows for the determination of the maximum contrast sensitivity of the patient in a single measurement, without knowing the spatial frequency at which that maximum occurs, which is possible because the spatial frequency is low enough that it is most likely below the maximum of the contrast sensitivity function in patients of any age.
Claims21
A method for measuring a contrast sensitivity of a patient, the method comprising:
- showing the patient a plurality of cards, each card including a square wave grating having a spatial frequency and a contrast,
- observing a behavioral response of the patient to each of the cards, and
- evaluating the contrast sensitivity of the patient based on the behavioral responses,
- wherein the spatial frequency of each square wave grating is the same, and
- wherein the contrast of each square wave grating is different.
A system for measuring a contrast sensitivity of a patient, the system comprising a plurality of cards, each card including a square wave grating having a spatial frequency and a contrast,
- wherein the spatial frequency of each square wave grating is the same, and
- wherein the contrast of each square wave grating is different.
An apparatus for measuring a contrast sensitivity of a patient, the apparatus comprising a substrate, the substrate including a low spatial frequency square-wave grating with a predetermined contrast.
Dependencies are inferred from the claim text.