- B -
A member of the carotinoid family of vitamins, a precursor to vitamin A
The simultaneous use of the two eyes. Normal binocular vision yields a stereoscopic image and parallax-induced depth perception
The ONH does not itself contain photoreceptors, and therefore its location at the back of the eye is a blind spot. This small area can be measured and in glaucoma, as the nerve fibers die, the blind spot tends to enlarge and enlongate. This is one of the diagnostic hallmarks of glaucoma.
Blind spot, physiological blind spot