Participant performing the visual search task while walking on the GRAIL treadmill looking at the fixation cross. Stimuli were presented in the range from -40° to +40° degree visual angle and ...

This article was originally published with the title “To Measure Distances by Visual Angles” inScientific American Magazine Vol. 10 No. 45(July 1855), p. 360doi:10.1038 ...

It is the most common type of glaucoma, a set of eye diseases that affect the eye's optic nerve. The optic nerve is located at the back of the eye and sends visual messages to the brain.