Ch16 Eye (Chabner Language of Medicine 13e)

accommodation

Normal adjustment of the eye to focus on objects from far to near

anterior chamber

The area behind the cornea and in front of the lens and iris

biconvex

Consisting of two surfaces that are rounded, elevated, and curved evenly; lens of the eye is biconvex

cone

Photoreceptor cell in the retina that transforms light energy into a nerve impulse; responsible for color and central vision

conjunctiva

Delicate membrane that lines the undersurface of eyelids and covers anterior eyeball

cornea

Fibrous transparent layer of clear tissue that extends over the anterior portion of eyeball

optic chiasm

The point at which optic nerve fibers cross in the brain

optic disc

The region at the back of the eye where the optic nerve meets the retina; blind spot

optic nerve

Cranial nerve carrying impulses from the retina to the brain

pupil

Central opening of the eye, surrounded by the iris, through which light rays pass

rod

Photoreceptor cell of retina essential for vision in dim light and for peripheral vision

sclera

Tough, white outer coat of the eyeball

thalamus

Relay center of the brain

aque/o

water

blephar/o, palpebr/o

eyelid

conjunctiv/o

conjunctiva

dipl/o

double

glauc/o

gray

irid/o, ir/o

iris

kerat/o

cornea

lacrim/o

tears

ocul/o, ophthalm/o

eye

presby/o

old age

-opsia, -opia

vision

-tropia

to turn

PERRLA

Pupils Equal Round and Reactive to Light and Accommodations