Eye

Question 1

Pathway of sight

Answer 1

Cornea Aqueous humor Iris/Pupil Lens Vitreous humor
Fovea/Macula Retina Rods/Cones Optic nerve Brain

Question 2

Cornea

Answer 2

Clear outer part of the eye
– Helps focus in front of the eye

Question 3

Aqueous humor

Answer 3

Thin watery fluid that fills the space between the cornea and the iris
Gives the front of the eye it’s form and shape

Question 4

Iris

Answer 4

Colored part of eye regulates the amount of light entering the eye

Question 5

Pupil

Answer 5

Opening at the center of iris
Size of opening controlled by iris

Question 6

Lens

Answer 6

Clear part of the eye behind the iris
Focus light onto retina allows focus on near and far objects

Question 7

Vitreous humor

Answer 7

Clear gel filling the inside of the eye
Holds shape of eye

Question 8

Retina

Answer 8

Light sensitive tissue that lines the back of the eyeball
Sends electrical impulses to the brain – Contains the macula and fovea

Question 9

Retinal scan

Answer 9

Identification through distinguishing marks of the retina

Question 10

Macula

Answer 10

Small, sensitive area of retina
Central vision
Contains fovea

Question 11

Fovea

Answer 11

Center of the macula
Sharpest vision
High concentration of rods (B & W) and cones (color)

Question 12

Rod cells

Answer 12

Located in retina
Modified neuron
Sensitive to light
Night vision , black and white

Question 13

Cone cells

Answer 13

Located in retina
* Modified neuron
* Distinguish colors in daylight

Question 14

Choroid

Answer 14

Layer of blood vessels that feeds the retina

Question 15

Sclera

Answer 15

Whites of the eyes
Tough outer layer

Question 16

Optic nerve

Answer 16

Bundle of sensory nerve fibers (over one million)
– Carries visual information to the brain (occipital lobe)

Question 17

Eyelid

Answer 17

Skin cover structure
Protection, spreads tears, limits light entrance

Question 18

Myopia

Answer 18

Near sighted
* Can only clearly see
objects up close * Lens focuses
light/image in front of the fovea

Question 19

Hyperopia

Answer 19

Far sighted
* Can only see objects
far away
* Lens focuses
light/image in back of the fovea

Question 20

Cataracts

Answer 20

Clouding of lens * Accumulation of
dead cells (protein
breakdown)
* Images look blurred
or fuzzy

Question 21

Astigmatism

Answer 21

Irregular shaped cornea or lens (correctable)
* Focus on two or more points instead of one
* Blurred vision, headaches, eye strain

Question 22

Glaucoma

Answer 22

“Silent thief of sight”
– Pressure gradually builds inside eye (retinal cells and optic nerve dies)
– Can cause irreversible blindness

Question 23

Conjunctivitis (AKA pink eye)

Answer 23

Inflammation of the conjunctiva (clear membrane that covers the sclera)
* Usually caused by Bacteria or viruses