vision A Flashcards
how is vision on the back of the eye (retina)
reduced, upside down
where is visual information transmitted to
the visual cortex
what does the vestibular apparatus cotnrol
balance
VOR purpose
keeps vision steady as head moves
orbit
bony cavity protecting the eye
nasolacrimal duct
drains tears into nasal cavity
lacrimal gland
secretes tears
retinal photoreceptor layers
ganglion cells
amacrine cells
bipolar cells
horizontal cells
cones and rods
rays must pass through
cornea
anterior chamber
pupil
lens
vitreous
inner retinal layers (ganglion, amacrine, bipolar, horizontal) to reach photocereptors
rays do not have to pass through
iris, retinal pigment epithelium, choriocapillaris, sclera
visual based neural signals pass thorugh
photoreceptors, intermediate retinal neurons, retinal ganglion cells (optic nerve) to LGN to visual cortex
where are blood vessels located in the eye
choroid layer
what absorbs excess light in the retina
pigment epithelium
what cell axons become the optic nerve
retinal ganglion
where must light rays focus
fovea
what initiates resolution of the finest detail
on the fovea, maximally focused image. bc light strikes the photoreceptors directly in the fovea bc the overlying neurons are pushed aside. photoreceptors at the fovea are less obscured by inner retinal layers
is the lens convex or concave when it becomes more powerful
convex. converges divergent rays coming from close objects onto fovea