pg 47- Flashcards
what is the function of the pigmented layer of the retina
absorb light that is transmitted through the neural layer; decrease reflection of light from choroid
t/f rods outnumber cones 20:1
true
what photosensitive chemical do rods contain?
rhodopsin
t/f rods are absent from the most central retina
true
what do rods contribute to visually?
peripheral vision: vision of low resolution, vision in low light conditions
what do cones contribute to visually?
color vision, vision of high resolution (acuity)
where are cones mostly found?
central most retina
what is the macula lutea?
central part of retina: visual center, in line with visual axis, ratio of cones to rods in high, area of retina for high visual acuity (5mm)
what is the fovea centralis
(1.1 mm) depression in center of macula, center of fovea only contains cones,
what is the ora serrata
peripheral border of functional retina
what is the optic disc (papilla)
(5.5 mm) area of retina where neuron fibers converge to form the optic nerve, blind spot of retina, medial and superior to macula,
what is papilledema
conditions of increased intracranial pressure
what are bipolar cells?
true neurons that innervate either rods or cones.
how many rods does a single bipolar cell engage with near the macula
10
how many rods does a single bipolar cell engage with near the ora serrata
100
