lecture 5 Flashcards
what are the two types of age related macular degrentration
wet and dry AMD
how do we treat AMD
anti vascular endothelial growth factor
how do we measure vascular beds in the retina
OCT angiography
what is the cause of diabetic retinopathy
bulges in blood vessels, leading to bleeding to retia causing scar tissue
what is the differences seen in the visual field seen in amd vs diabetic retinopathy?
AMD- central vision loss
diabetic retinopathy- blotchy all around vision
what are 4 types of retinal ganglion cells?
M-type - magnocellular
P-type - Parvocellualr
k-type - Koniocellular
and light sensitive
what are the feature of m-type retinol ganglion cells?
have large receptive field’s (parasol cells) used to detect gross features
are sensitive to motion
and are not colour sensitive
what are the features of P-type retinol gangilion cells ?
small receptive feilds (midget cells) used to detect fine features
colour sensitive (red and green cones)
what are the features of K-type cells?
very small cells
receive input from blue cells
function is unclear
but contribute to circadian rhythms
what is the optic nerve head rim made of?
the nerve fibers dropping into the optic neve?
what is the lamina cribrosa? what is its fuction
collagen structure that seals the eye to maintain eye pressure
what is a papilledema?
optic nerve being pushed forward due to increases pressure in brain
what percentage of retinal ganglion cells cross at the optic chiasm?
55%
what are the features we see as we have a chiasm
each cortical hemisphere sees the oposite feild and receives inputs from both eyes
why do we have a chiasm?
to provide retinal disparity to provide 3d vison?
