THE EYE & COMMON PROBLEMS [B10.5 & 10.6]

Question 1

The coloured part of the eye? (around pupil)

Answer 1

Iris

Question 2

Transparent area of sclera at the front of the eyeball

Answer 2

Cornea

Question 3

Hole where light enters the eye

Answer 3

Pupil

Question 4

Clear disc behind the pupil

Answer 4

Lens

Question 5

Both ends of the lens

Answer 5

Suspensory Ligament

Question 6

Both ends of Supensory Ligament

Answer 6

Ciliary Muscle

Question 7

White outer layer of the eye

Answer 7

Sclera

Question 8

Back of the eye (inside)

Answer 8

Retina

Question 9

Back of the eye (leading out the eye)

Answer 9

Optic Nerve

Question 10

Function of the Iris

Answer 10

Controls light that enters the pupil by contracting or relaxing to change the size of the pupil.

Question 11

Function of Ciliary Muscle

Answer 11

Contracts + relaxes to accommodate for seeing near + far.

Question 12

Function of Retina

Answer 12

Where light is focused on the light-sensitive cells of retina.

Question 13

Myopia

Answer 13

Short-sightedness

Question 14

Hyperopia

Answer 14

Long-sightedness

Question 15

CAUSES for Myopia

Answer 15

Lens too curved OR long eyeball SO light in focused front of the retina (falls short) SO images are blurry

Question 16

CAUSES for Hyperopia

Answer 16

Lens too flat/thin OR short eyeball SO light is focused BEHIND the retina or the lens can’t refract strongly enough SO images are out of focus

Question 17

ACCOMMODATION for Myopia

Answer 17

Glasses with CONCAVE lens to SPREAD OUT the light before it reaches the eye so that it is in perfect focus on the retina

Question 18

ACCOMMODATION for Hyperopia

Answer 18

Glasses with CONVEX lens to bring light rays together before they reach the eyeball so that they will be brought in perfect focus of the retina.

Question 19

ACCOMMODATION for seeing FAR

Answer 19

ciliary muscle RELAXES, pulmonary ligament CONTRACTS, lens becomes THINS —-> LESS light refraction

Question 20

ACCOMMODATION for seeing NEAR

Answer 20

ciliary muscle CONTRACTS, pulmonary ligament RELAXES, lens becomes THICK —-> MORE light refraction