Eye

Question 1

Pupil

Answer 1

Dark opening of the eye; is black because there is no light reflecting from it

Question 2

Iris

Answer 2

Coloured portion of the eye

Question 3

Conjunctiva

Answer 3

Delicate membrane lining the eyelids and covering the eyeball up to the cornea

Question 4

Cornea

Answer 4

Transparent dome tissue over the iris and pupil

Question 5

Lens

Answer 5

Bends light rays to bring them into focus on the retina; transparent and located behind the pupil of the eye

Question 6

Retina

Answer 6

Light sensitive (rods and cones) layer of nerve cell containing photoreceptor cells

Question 7

Sclera

Answer 7

Tough white outer coat of eyeball

Question 8

Choroid

Answer 8

Middle, vascular layer of the eye, located between the retina and sclera

Question 9

Ciliary body

Answer 9

Structure surrounding the lens that connects iris to the choroid, contains ciliary muscles that control the shape of the lens and secretes aqueous liquid

Question 10

Uvea

Answer 10

• iris
• ciliary body
• choroid

Question 11

Aqueous humor

Answer 11

Fluid produced by the ciliary body found in the anterior chamber.

Question 12

Refraction

Answer 12

Bending of light rays by cornea, lens, and fluid of the eye to bring light rays into focus on retina (refract means to break)

Question 13

Accommodation

Answer 13

Far and near sightedness

Question 14

Anterior chamber

Answer 14

Area behind the cornea and in front of lens and iris that contains aqueous humor (fluid)

Question 15

Vitreous humor / chamber

Answer 15

Large soft jelly like region behind the lens

Question 16

Cones

Answer 16

Colour and central vision in bright lights

Question 17

Rods

Answer 17

Vision in dim lights and peripheral vision

Question 18

Optic nerve

Answer 18

Cranial nerve carrying impulse from retina to brain

Question 19

Optic disc

Answer 19

Blind spot

Question 20

Macula

Answer 20

Oval region on the retina near the optic disc and it contains the fovea centralis

Question 21

Fovea centralis

Answer 21

Tiny pit / depression in retina which is the region for clearest vision

Question 22

Fundus

Answer 22

Inner/ posterior part of the eye that is seen through a ophthalmoscope

Question 23

optic chiasm

Answer 23

where optic never fibers cross in the brain

Question 24

biconvex

Answer 24

two surfaces that are rounded, elevated, and curved evenly like a sphere; lens is a biconvex