Vision physiology Flashcards
macula is what
area of retina dominated by cones
contains fovea
fovea is what
area where cone photoreceptors most tightly packed together
(optic nerve) central cup is what
where there is no neuro-retinal tissue
what happens when there is a loss of ganglion cell axons in the retina
the central cup gets bigger
= finding in glaucoma
where is the first synapse after the ganglion cell (from photoreceptors)
lateral geniculate nucleus (part of thalamus relay station)
chiasmal lesion causes what defect
bitemporal hemianopia
complete lesion of right optic nerve would cause what defect
total blindness of right eye
lesion in left hemisphere would cause what visual defect
right homonoymous hemianopia
lesion of left temporal lobe would cause what visual defect
right superior quadrantanopia
what are the two functional streams of visual information
dorsal stream - appraising/where
ventral stream - what
