Chapter 17 Vocab

Question 0

anterior chamber

Answer 0

area behind the cornea and in front of the lens and iris. Contains aqueous humor (blood, lymph and water)

Question 1

accommodation

Answer 1

normal adjustment of the eye to focus from near to far

Question 2

aqueous humor

Answer 2

fluid produced by the ciliary body and found in the anterior chamber

Question 3

biconvex

Answer 3

consisting of two surfaces that are rounded, elevated and curved evenly like part of a sphere

Question 4

choroid

Answer 4

middle vascular layer of the eye, between the retina and sclera

Question 5

ciliary body

Answer 5

structure surrounding the lens that connects the choroid and iris

Question 6

cone

Answer 6

photoreceptor in the retina that transforms light energy into a nerve impulse

colour, central vision, clarity

Question 7

conjunctiva

Answer 7

delicate membrane lining the undersurface of the eyelids covering the anterior eyeball

Question 8

cornea

Answer 8

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

Question 9

fovea centralis

Answer 9

tiny pit or depression in the retina that is the region of clearest vision

Question 10

fundus of the eye

Answer 10

posterior inner part of the eye

Question 11

iris

Answer 11

pigmented colour layer that opens and closes to allow more or less light into the eye

Question 12

lens

Answer 12

transparent biconcave body behind the pupil of the eye. bends and refracts light rays to bring them into focus

Question 13

macula

Answer 13

yellowish region on the retina lateral to and slightly below the optic disc; contains the fovula centrails, which is the area of clearest vision

Question 14

optic chiasm

Answer 14

point at which the nerve fibre crosses over in the brain

Question 15

optic disc

Answer 15

region at the back of the eye where the optic nerve meets the retina. blind spot in the eye because there are no rods or cones there

Question 16

optic nerve

Answer 16

cranial nerve carrying impulses from the retina to the brain

Question 17

pupil

Answer 17

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

Question 18

refraction

Answer 18

bending of the light rays by the cornea, lens and fluid of the eye to bring back into focus on the retina

Question 19

retina

Answer 19

light-sensitive nerve layer of the eye containing photoreceptor cells

Question 20

rod

Answer 20

photoreceptor cell of the retina essential for vision in dim light and for peripheral vision

Question 21

sclera

Answer 21

tough, white outer coat of the eyeball

Question 22

thalamus

Answer 22

relay centre of the brain

Question 23

viterous humor

Answer 23

soft jelly-like material behind the lens in the vitreous chamber; helps maintain the shape of the eyeball