Uberon definition : The optic disc or optic nerve head is the location where ganglion cell axons exit
the eye to form the optic nerve. There are no light sensitive rods or cones to respond
to a light stimulus at this point. This causes a break in the visual field called
'the blind spot' or the 'physiological blind spot'. The optic nerve head in a normal
human eye carries from 1 to 1.2 million neurons from the eye towards the brain. [WP,unvetted].;
Uberon synonym : optic disk;
Uberon related term : optic papilla; optic disk; physiologic blind spot; optic nerve disc; physiologic blind spot of mariotte; optic nerve head;
Uberon Homology note : (...) we reach the inescapable conclusion that the last common ancestor of jawless
and jawed vertebrates already possessed an eye that was comparable to that of extant
lampreys and gnathostomes. Accordingly, a vertebrate camera-like eye must have been
present by the time that lampreys and gnathostomes diverged, around 500 Mya (reference
1); Although the eye varies greatly in adaptative details among vertebrates, its basic
structure is the same in all. The human eye is representative of the design typical
for a tetrapod (reference 2).[well established][VHOG];
The optic disc or optic nerve head is the location where ganglion cell axons exit
the eye to form the optic nerve. There are no light sensitive rods or cones to respond
to a light stimulus at this point. This causes a break in the visual field called
'the blind spot' or the 'physiological blind spot'. The optic nerve head in a normal
human eye carries from 1 to 1.2 million neurons from the eye towards the brain. [WP,unvetted].