Zone Of Glare Testing Concept

This illustrates the pattern of detecting "first" glare for each of three sessions, across the 6 binoculars. Glare was noted at the first encounter where it had grown to about 1/4 of the FOV. It was usually in a crescent or half-moon shape on the opposite side of the FOV from the light source. Eight tests were done for each binocular per session, and there were 3 sessions. First glare was noted along each of the radial paths toward the light source to the nearest 5 degrees. The dark room for the tests was laid out with degree markers in advance in increments of 5 degrees, from 45 to 5, along the radial paths. Glare, once noted, always increased toward the light source. There were no exceptions.