Sight vocab

Question 1

Accommodation

Answer 1

Normal adjusment of the eye to focus on objects from fat to near. when this occurs, the ciliary body adjusts the lens (rounding it) and the pupil constricts. when the eye focuses from near to far, the ciliary body flattens the lens and pupil dilates

Question 2

Anterior chamber

Answer 2

Area behind the ciliary body and found in the antierior chamber. A humor is a body of fluid, including blood and lymph

Question 3

Biconvex

Answer 3

Consisting of two surfaces that are rounded, elevated and curved evenly like part of a sphere. the lens of the eye is a biconvex body

Question 4

Choroid

Answer 4

middle, vascular layer of the eye between retina and sclera

Question 5

Ciliary Body

Answer 5

Structure surrounding the lens that connects the iris to the choriod. It contains ciliary muscles, which control the shape of the lens and it secretes aqueous humor

Question 6

Cone

Answer 6

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

Question 7

Fovea Centralis

Answer 7

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

Question 8

Conjunctiva

Answer 8

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

Question 9

Cornea

Answer 9

Fibrous transparent layer of clear tissue that extends over the anterior protion of the eyeball. Derived from latin word corneus meaning horny, because it protrudes outward resembling a horn

Question 10

Fundus of the eye

Answer 10

posterior, inner part of the eye;visualized with an ophthalmoscope

Question 11

Iris

Answer 11

Pigmented (coloured) layer that opens and closed to allow more or less light into the eye. the central opening of the iris is the pupil

Question 12

Lens

Answer 12

transparent biconvex body behind the pupil of the eye. it bends (refracts) light rays to bring them into focus on the retina.

Question 13

Macula

Answer 13

Small oval region on the retina that is the optic disc; contains the fovea centralis, which is the area of clearest vision.

Question 14

Optic disc

Answer 14

Region at the back of the eye where the optic nerve meets the retina.it is the blind spot of the ete because it contains nerve fibers, no rods or cones, and is thus insensitive to light

Question 14

Optic nerve

Answer 14

Cranial nerve carrying impulses from the retina to the brain (cerebral cortex)

Question 15

Optic chiasm

Answer 15

point at which optic nerve fibers cross in the brain (chiasma means crossing)

Question 16

Pupil

Answer 16

Central opening of the eye, surrounded by the iris, through which light rays pass. it appears dark

Question 17

Refraction

Answer 17

Bending of light rays by the cornea, lens, and fluids of the eye to bring the rays into focus on the retina
* refract means to break (-fract) back (re-)

Question 18

Retina

Answer 18

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

Question 19

Rod

Answer 19

Photoreceptor cells of the retina essential for vision in low light and peripheral vision

Question 20

Sclera

Answer 20

Tough, white outter coat of the eyeball

Question 21

Thalamus

Answer 21

Relay center of the brain. Optic nerve fibers pass through the thalamus on their way to the cerebral cortex

Question 22

Vitreous Humor

Answer 22

Soft, jell- like material behind the lens in the vitreous chamber; helps maintain the shape of the eyeball. Often referred to as the vitreous