eyeball structure

Question 1

Iris

Answer 1

helps regulate the amount of light entering the eye (e.g. closing the pupil to let in less light when a bright light is present, vice versa)

Question 2

Cornea

Answer 2

protects the structures inside the eyeball contributing to refracting power of eye and focusing light rays on the retina w/ minimum scatter and optical degradation

Question 3

Pupil

Answer 3

controls the amount of light entering the eye via contraction (miosis) and dilation (mydriasis) under the influence of the autonomic nervous system

Question 4

Lens

Answer 4

transmits light, focusing it on the retina

Question 5

Sclera

Answer 5

supporting wall of eyeball; helps maintain eyeball’s shape and protects from injury

Question 6

Ciliary Body

Answer 6

part of the middle layer of the eye wall; found behind the iris; changes the shape of the lens when the eye focuses/ makes the clear fluid that fills the space between the cornea and iris

Question 7

Choroid

Answer 7

thin layer of tissue, part of the middle layer of the eye’s wall (between sclera and retina); filled with blood vessels that bring oxygen and nutrients to the eye

Question 8

Optic Nerve

Answer 8

relays messages from the eyes to the brain to create visual images

Question 9

Mecula

Answer 9

translates light that enters the eye into the images seen

Question 10

Retina

Answer 10

layer of photoreceptor cells and glial cells within the eye that captures incoming photons and transmits them along neuronal pathways as both electrical and chemical signals for the brain to perceive a visual picture

Question 11

Vitreous

Answer 11

clear, gel-like substance that helps keep the eye’s shape

Question 12

Aqueous Humor

Answer 12

a clear liquid inside front of eye; nourishes the eye + keeps it inflated