Comprehensive Visual Field Test and Diagnosis System for Visual Performance Assessment in Military Settings

We have developed an Internet-based, integrated, and comprehensive visual field test and diagnosis system to assess the visual performance of warfighters, veterans, and civilians. The system is based on the 3D Computerautomated Threshold Amsler Grid (3D-CTAG) test. In multiple clinical studies 3D-CTAG has proven to be innovative and successful for fast, easy, accurate, noninvasive, and comprehensive visual field testing. With one eye covered, the subject is positioned in front of a touch-sensitive computer screen on a head-chin rest and finger-traces the areas of an Amsler grid that are missing from his field of vision. Various degrees of contrast of the Amsler grid are presented by repeating the test at different grayscale levels. The resulting 3D data represent the measured contrast sensitivity across the tested visual field and are stored in a relational MySQL database. We have created an automated and integrated artifact removal, analysis, and characterization system, which analyzes 3DCTAG visual field data and objectively identifies and characterizes the occurring visual field defects (scotomas) within according to visual field data transforms and scotoma data transforms. Following each test, a topographical contour map, a 3D depiction of the central hill-of-vision, and the comprehensive visual field and scotoma characterization are automatically generated and displayed onscreen, using the freely available Gnuplot plotting package.