Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Biology > the eye > Flashcards

the eye Flashcards

1
Q

what is the eye

A

a sense organ containing receotors sensitive to light and colour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is the cornea

A

transparent layer at the frint of the eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is the function of the cornea

A

to refract light into the eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is the iris

A

the coloured part of the eye that contains muscles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the function of the iris

A

to control the amount of light entering the eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what is the pupil

A

the hole in the middle of the iris

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what is the function of the pupil

A

to let light in, its diamter is controlled by the iris

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what is the lens

A

transparent biconvex structure in the eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what is the role of the lens

A

to refract light onto the retina

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is the retina

A

a thin layer of tissue at the back of the eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what is the role of the retain

A

contains receptor cells caled rod and cone cells for light and colour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what is the sclera

A

the tough white supporting wall of the eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what is the ciliary muslces

A

muscls that are connected to the lens by the suspensory ligaments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

what is the role of the cilliary muscles

A

to change the shape of the lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

what is the suspensory ligaments

A

these connect the lens to the cilliary muscles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

what is the role of the optic nerve

A

to carry impulses from the retina to the brain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

what is accommodation

A

the processs of changing the shaoe of the lens to focus on near or distant objects

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

how does the eye focus on distant objects

A
  1. the cilliary muscles relax
  2. the suspensory ligaments are pulled tight
  3. the lens is then pulled thin and only slightly refracts light rays
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

how does the focus on near objects

A
  1. the cillary muscles contract
  2. the suspensory ligamnets loosen
  3. the lens is then thicker and refracts light rays strongly
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what are two common defects of the eye

A

myopia and hyperopiaa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what is myopia

A

short sightedness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what is hyperopia

A

longsightedness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

what can people with myopia not do

A

focus on objects tjat are far away

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

why does myopia occyr

A

when the eyeball is too long

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

how can myopia be corrected

A

with concave lenses so that the light rays focus on the retina

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

when you have myopia what do the light rays do

A

light rays from distant objects focus in the eyeball in front of the retina

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

what can people with hyperopia no do

A

focus on objects that are near

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

when does hyperopia occur

A

when the eyeball is too short

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

when you have hyperopia what do the light rays do

A

lighht rays from distant objects focus in the eyeball behind the retina

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

how can hyperopia be corrected

A

with convex lenses so that light rays focus on the retina

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

what are rod cells

A

they enable us to see objects in dim light and do not detect colour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

what are cone cells

A

they enable us to see objects clearly in bright light and in colour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q
A
46
Q
A
46
Q
A
47
Q
A
48
Q

how many tyoes if cone cells are there

A

3

49
Q

what are the types of cone cells called

A

red, green and blue

50
Q

how do cone cells function in dim light

A

not well

51
Q
A
52
Q

what is colour blindness

A

a condition that a person is born with and is inherited from their parents

53
Q

why are more men than women colour blind

A

the gene is carried on the x chromosome

54
Q
A
54
Q
A
55
Q

what can a person with colour blindess not do

A

tell the diffrence between certain colours

56
Q

why is the most common condition red green colour blindness

A

because they do not ufnction normally

57
Q

is there a cure for colour blidnewss

A

no

58
Q

how can cateracts be cured

A

by replacing the lens with an articical one

59
Q

what do people with cateracts find difficult

A

to see bright light or an accurate colour

59
Q

what do people with cateracts often jave

A

blurred vision

60
Q

why do people with cateracts find it difficult to see bright light or an accurate colour

A

due to a cloudy patch on the lens, light is unable to enter the eye normally

61
Q

name 3 new technologies to correct vision `

A

contact lenses, laser surgery and lens replacement

62
Q
A
62
Q
A
62
Q
A
62
Q
A
62
Q
A
62
Q
A
62
Q
A
62
Q
A
63
Q
A
63
Q
A
63
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
64
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
65
Q
A
66
Q
A
67
Q

what are contect lenses

A

these can be hard or soft and are inserted directly into the eye and sit on the cornea. this then refracts the light rays

67
Q
A
67
Q

what are the advantaages of contact lenses

A

1

67
Q
A
67
Q
A
67
Q
A
67
Q
A
67
Q
A
67
Q
A
67
Q
A
67
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
68
Q
A
69
Q

.

A
69
Q

what is laser surgery

A

the other layer of the cornea is peeled back and lasers are used to change the hspae of the cornea so that the light rays will refract and form an image on the retina

70
Q

what are the advantages of laser eye surgery

A

permant solution to correct vision

71
Q
A
72
Q

what are the disadvantages of laser eye surgery

A
  1. surgical procedure
  2. can cause infections
73
Q
A
74
Q

what is the lens replacement

A

an artificial acrylic/silicone lens is implanted into the eye to correct problem with vision

75
Q

what are the advantages of lens replacement

A

permanent solution ro correct vision

76
Q

what are the disadvantges to lens replacement

A

1, surgical procedure
2. can cause infections

Biology (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions