Special Senses: Vision Flashcards
primary areas of fluid filled chambers
anterior & posterior
the 2 primary fluid filled chambers are filled with what
Aqueous humor
name of chamber behind the lens
vitreous
vitreous chamber is filled with what
vitreous humor
cornea does what?
focuses
retina does what?
converts a visual image into nerve action potentials
retina has how many neuron layers
7-10
Transduction is accomplished by what part of the eye
photoreceptors
pigment that can be alter very rapidly by light to generate depolarization or hyperpolarization of a nerve cell membrane
photoreceptors
types of photoreceptors
cones & rods
Different pigments that are sensitive to different frequencies of light
cones
what colors does cones have?
blue, red, & green
Cones are most numerous in
the fovea
Highly sensitive to dim light (night vision)
rods
insufficient amount of what vitamine can cause night blindness
vitamine A
primary area where visual images are focused
fovea
what surrounds the macula
fovea
blind spot of the visual field
optic disc
Depth perception
binocular vision
lesion at the optic nerve on one side or 1 complete eye losses of vision is what?
Monocular Blindness
lesion at the optic chiasm or loss of 1 visual field loss is what?
Bitemporal Hemianopia
lesion at the optic tract or 1 full visual field is loss is what?
Homonymous Hemianopia
O.S is what?
visual field of the left eye
O.D is what?
visual field of the right eye
if there is a lesion in the optic pathway will one demonstrate pupillary light reflex?
no
as long as the optic pathway is intact what will happen with the pupillary light reflex?
the reflex will still occur since it crosses bilaterally in the pretectum nucleus
Pupillary dilation is under the control of
sympathetic nervous system
