Eye Functions

Question 1

Sclera

Answer 1

White of eye, thick connective tissue aka fibrous tunic

Question 2

Cornea

Answer 2

Part of sclera (clear area) where light enters eye, has nerve endings (pain), only transplanted tissue without rejection, no blood flow

Question 3

Choroid coat

Answer 3

Blood rich tunic, has dark pigment that prevents light scattering, anterior forms ciliary bodies and iris

Question 4

Ciliary body

Answer 4

Muscle where lens is attached

Question 5

Iris

Answer 5

Muscle acts like diaphragm to regulate pupil opening

Question 6

Retina

Answer 6

Inner most layer, white, extended anteriorly to ciliary body, contains photoreceptors (rods and cones), not evenly distributed

Question 7

Optic nerve

Answer 7

Area of ganglion cell axons that leave the eye

Question 8

Optic disc

Answer 8

Area of retina directly over the optic nerve, does not contain any photoreceptors, aka blind spot

Question 9

Fovea centralis

Answer 9

Area of a tiny pit that contains only cones, area of sharpest vision

Question 10

Lens

Answer 10

Flexible biconvex crystal like structure, held in place by suspensory ligament attached to ciliary body, divides anterior eye from posterior, feels like hard jelly

Question 11

Aqueous humor

Answer 11

Clear watery liquid, similar to blood plasma, maintains ocular pressure, continuously secreted by special area of cornea, provides nutrients for lens and cornea, reabsorbed through scleral venous sinus

Question 12

Vitreous humor

Answer 12

Gel like substance, maintains shape, prevents collapsing, maintains pressure

Question 13

Pupil

Answer 13

Close vision/ bright light circular muscles contract and pupil constricts
Distant vision/dim light circular muscles contract and dilate pupil