eye

Question 1

what do cones detect`

Answer 1

colour

Question 2

what do rod cells detect

Answer 2

colour

Question 3

what can’t cones do?

Answer 3

work in dark environments

Question 4

what cant rods do?

Answer 4

see in colour, they can only detect black and white.

Question 5

what is tje fovea?

Answer 5

an area which only has cone cells, where light is focussed on to see properly.

Question 6

what is the cornea?

Answer 6

transparent layer that refracts light.

Question 7

does the cornea have any blood cells

Answer 7

no

Question 8

where does the cornea get oxygen from

Answer 8

it diffuses from the air

Question 9

what is the iris?

Answer 9

coloured part of the eye that controls how much light enters

Question 10

what is the lens?

Answer 10

can change shape to change the way it bends light

Question 11

what is the retina?

Answer 11

contains rod and cone (receptor) cells

Question 12

what is the optic nerve?

Answer 12

takes all impulses generated from receptor cells and sends them to the brain

Question 13

what is the iris reflex?

Answer 13

it controls light intensity

Question 14

what does the iris reflex protect us from

Answer 14

retina damage from too much light.

Question 15

what are the iris reflex actions controlled by

Answer 15

the circular and radial muscles

Question 16

name of the shrunken pupil

Answer 16

constriction

Question 17

name of the widened pupil

Answer 17

dialated

Question 18

when are pupils constricted

Answer 18

in high light conditions

Question 19

when are pupils dialated

Answer 19

in low light conditions

Question 20

where are the circular muscles situated?

Answer 20

in the inside, stretching around the pupil

Question 21

where are the radial muscles situated

Answer 21

on the outside, stretching around the circular muscles

Question 22

what happens to the eye muscles when the pupil is constricted

Answer 22

• circular muscles contract, tightening the pupil so its smaller,
• radial muscles relax, stretching out so that the pupil stays small

Question 23

what happens to the eye muscles when the pupil is dialated

Answer 23

• circular muscles relax, allowing the pupil to stretch
• radial muscles contract, stretching the pupil to let more light in

Question 24

what is accommodation

Answer 24

changing the shape of the lens to focus on near or distant objects

Question 25

what parts of the eye control the shape of the lens

Answer 25

suspensory ligaments and ciliary muscles

Question 26

shape of lens while refracting a close object

Answer 26

short and fat so that it refracts stronger

Question 27

what do the ciliary muscles and suspensory ligaments do when a object is near

Answer 27

• ciliary muscles contract inwards
• suspensory ligaments relax so lens becomes short and fat

Question 28

shape of lens while refracting a far object

Answer 28

thin and stretched

Question 29

what do the ciliary muscles and suspensory ligaments do when an object is far

Answer 29

• ciliary muscles relax to thin out lens
• suspensory ligaments are pulled to stretch out lens and refract light less intensely

Question 30

what is the name for when the lens doesn’t refract enough

Answer 30

hyperopia (long sightedness)

Question 31

what additional lenses are used for myopia

Answer 31

concave lenses

Question 32

what is the name for when the lens refracts too much light

Answer 32

myopia (short sightedness)

Question 33

what additional lenses are used for hyperopia

Answer 33

convex lenses