vision 101 Flashcards
light
stimulus for vision
wavelength
humans can see wavelengths of 400-700 nanometers
how is light seen
when it reflects off objects in the environment
Lens (parts of eye)
directly behind pupil. changes shape as you try to focus
pupil (parts of eye)
opening of eye that allows light to enter
iris (parts of eye)
color of your eye. allows pupil size to change
cornea (parts of eye)
transparent. covers front side of eye
fovea (parts of eye)
focal point in retina. only has cones. used to detect fine detail
retina (parts of eye)
back of eye, contains rods and cones.
cones
provide color vision and sharp detail
rods
Vision in dim light, detect movement
optic nerve (parts of eye)
transmits visual info to brain through the back of the eye
bipolar cells
combines impulses from retina and transmits to ganglion cells
ganglion cells
relay info from retina tp brain
horizontal cells
combines rods and cones and sends signals back to receptors to adjust to light and dark
amacrine cells
connects bipolar cells to ganglion. inhibitory neurons
macular degeneration
progressively destroys macula. hard to see straight
retinitus pigmentosa-
abnormalities in rods and cones. progressive vision loss in periphery
blind spot
area where all the nerves leave the eye which leaves a blind spot with no cones or rods and that area is filled in with its surroundings
dark adaption
cones and rods become more sensitive
pigment regenerates
rhodopsin
helps see in dim lighting. when it sees light the pigment bleaches. found in rods
