part 2 Flashcards
contains vascularity necessary to provide nourishment
choroid layer
innermost layer that extends only to the ciliary body anteriorly.
retina
it receives visual stimuli and sends it to the brain
retina
what are the numerous layers of nerve cells in the retina that are often referred to as ‘photoreceptors’ because they are responsive to light
rods and cones
is a cream colored circular area located on the retina toward the medial or nasal side of the eye.
optic disc
a smaller circular area that appears slightly depressed is referred to as the _____
physiologic cup
are dark red and grow progressively narrower as they extend out to the peripheral areas.
venules
it carries oxygenated blood and appears brighter red and narrower than the veins.
arterioles
it is located adjacent to the optic disc in the temporal section of the fundus.
retinal depression or fovea centralis
fovea centralis is surrounded by the _____ which appears darker than the rest of the fundus.
macula
This maintains the structure of the eye that protects against injury and transmits light rays
chambers
this chamber is located between the cornea and iris.
anterior chamber
this chamber is located between the iris and lens.
posterior chamber
posterior chambers are filled with ____, a clear substance produced by the cilliary body.
aqueous humor
the aqueous humor filters out of the eye from the posterior to the anterior chamber then into the canal of schlemm through a filtering site called ____
trabecular meshwork
the ____ chamber is located in the area behind the lens to the retina. it is the largest of the chambers that is filled with a vitreous humor that is clear and gelatinous.
vitreous chamber
refers to what a person sees with one eye.
visual fields
what are the four quadrants of visual fields?
upper temporal
lower temporal
upper nasal
lower nasal
occurs as light rays, strike the retina, where they are transformed into nerve impulses, conducted to the brain through the optic nerve and interpreted
visual perception
what are the main components that refract the light rays on the retina
cornea and lens
the point where the optic nerve from each eyeball cross
optic chiasma
causes pupils immediately to constrict when exposed to bright light.
pupillary light reflex
this can be seen as ___ reflex in which constriction occurs in the eye exposed to the light.
direct reflex
this can be seen as ____ reflex when exposure to light in one eye results in constriction of the pupil in the opposite eye
indirect or consensual reflex
is a functional reflex allowing the eye to focus on near objects.
accommodation
