Patent ID: 7771052
Filing Date: 2010-08-10
Classification: A61B

Abstract:
1. A contrast vision test method for determining a contrast sensitivity function of a subject, said method comprising the steps of: (a) displaying visually to the subject, under a specified ambient viewing condition, a sinusoidal grating pattern, said grating pattern having a first axis, a second axis, a spatial frequency and a contrast, said spatial frequency changing continuously along said first axis, said contrast changing continuously along said second axis, said second axis being perpendicular to said first axis; (b) determining, based on a response of the subject to viewing said grating pattern under said ambient viewing condition of step (a), a visual contrast sensitivity curve of the subject which defines the ability of the subject to visually discern said grating pattern under said ambient viewing condition of step (a); (c) repeating steps (a) and (b) at least once with each respective repetition being carried out under a different respective said ambient viewing condition to determine at least one respective additional visual contrast sensitivity curve of the subject, each respective said additional visual contrast sensitivity curve defining the ability of the subject to visually discern said grating pattern under a respective one of said different ambient viewing conditions, and (d) statistically determining a contrast sensitivity function of the subject based on said visual contrast sensitivity curve and said at least one additional visual contrast sensitivity curve.