Eye - general

Question 1

list general structures of eye (not including eye itself)

Answer 1

• eye cavity bones
• eyelids
• conjunctiva
• eyelashes & eyebrows
• lacrimal glands

Question 2

list the 3 tunics of eye

Answer 2

fibrous, vascular, & nervous

Question 3

describe the FIBROUS TUNIC

Answer 3

sclera & cornea

Question 4

describe the VASCULAR TUNIC

Answer 4

choroid, ciliary muscle, & suspensory ligaments

Question 5

describe the NERVOUS TUNIC

Answer 5

retina + (rods & cones)

Question 6

define CORNEA

Answer 6

clear continuation of sclera that does most of refracting

Question 7

what are the structures that refract light

Answer 7

• cornea
• aqueous humor
• crystalline lens
• vitreous body

Question 8

define AQUEOUS HUMOR

Answer 8

watery fluid filling anterior from cornea to lens

Question 9

describe CRYSTALLINE LENS

Answer 9

clear & elastic w/2 bulging surfaces that refracts & accommodates light

Question 10

list parts of the RETINA

Answer 10

• pigmented layer
• rods
• cones
• connecting neurons
• tapetum lucidum

Question 11

define PIGMENTED LAYER

Answer 11

prevent scattering of light within retina that is sensitive to light

Question 12

what do RODS process/see

Answer 12

dim light, shades of gray, & blurred images

Question 13

what do CONES process/see

Answer 13

bright light/colors/sharp images

Question 14

what are the colors of the cones

Answer 14

red, green, blue

Question 15

define CONNECTING NEURONS

Answer 15

carry impulse from rods/cones to optic nerve

Question 16

define TAPETUM LUCIDUM

Answer 16

retroreflective behind retina in many nocturnal/deep sea animals

Question 17

describe EXTRINSIC EYE MUSCLES

Answer 17

on outer surface & voluntary; controls convergence for 3D images

Question 18

describe INTRINSIC EYE MUSCLES

Answer 18

within eye in iris to regulate light entrance & in ciliary muscles to accommodate

Question 19

define ACCOMMADATION

Answer 19

shape lens for near & far

Question 20

what happens to the eye to see farther

Answer 20

create bigger opening for light & flattens lens

Question 21

what happens to eye to see closer

Answer 21

thickens lens to increase light refraction

Question 22

give the steps for the process of vision

Answer 22

1. extrinsic muscles cause convergence
2. light refracts thru cornea & aqueous humor
3. iris muscles adjust pupil
4. ciliary muscles accommodate
5. light refracts further thru vitreous body
6. light stimulates retina
7. optic nerve transmits impulse to brain
8. occipital lobe interprets