Method and Apparatus for Objective Determination of Visual Contrast Sensitivity Function.
Abstract
A method and apparatus for objectively determining the visual contrast sensitivity function of a human subject involves subjecting the vision of the human subject to a plurality of sine wave gratings differing in spatial frequency and contrast levels. As the subject views the grating patterns on a video monitor, the brain wave activity of the subject is detected and steady state Fourier spectra of the activity are recorded. In each spectrum corresponding to a grating pattern of a particular spatial frequency, a visual evoked potential component may be distinguished from noise by adjusting the contrast level of the grating pattern. A contrast threshold used in deriving the visual contrast sensitivity function is identified for each grating pattern of a particular spatial frequency by pinpointing the contrast level at which the visual evoked potential component becomes indistinguishable from noise in the spectrum. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1982
- Accession Number
- ADD009701
Entities
People
- Mark W. Cannon Jr.
Organizations
- United States Department of the Air Force