Brainscape's Knowledge GenomeTM

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


See full index

CNS > refraction and accomodation > Flashcards

refraction and accomodation Flashcards

1
Q

what is refraction

A

the bending of light

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

what are the 2 main sturctres that are involved in refraction

A

lens and cornea

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

which of the lens or the cornea is more powerful

A

cornea

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

whihc of the lens or cornea can change diameter

A

lens

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

at waht disttance doe shtan object need to be far enough away for the light rays coming of it to be parrell

A

6m

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

how does the corena and lens make the light go to the retian

A

they bend it

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

what happens to the picutre as it lands on the retian compared to when it entered the eye

A

it is flipped 180 degrees due to refraction

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

how does the lens thickenss change as it you read something closer

A

it gests thicker, congering the light more

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

what is accomoation

A

change of foucos on diatnant obects

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

what are 3 ways the eyes accomodate light rays

A

lens changes shape
pupils constrict
eyes converge

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

how does the cilary body cuase the lens to relax and become thicker

A

it contracts, and the ligaens aroun it luose, tus making it thicker

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

is capillary body contracting sympatheic or parasympahtic

A

parasympathiec

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

what hapens to the pupil to look at an object uplcose

A

it consticits

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

msucle whihc cuase puoli to constrict

A

pupilary constior/ spictor pupillae

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

what type of innervation is consticitor pupillae

A

parasympethic

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

what mucles are used of eye converion

A

medial rectus

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

what type of inervvation for medial rectus

A

3 cn - parasympethic

18
Q

what is myopia

A

short sitedness

19
Q

what is hyperopia

A

long sitedness

20
Q

what is astigmatism

A

where the eye is not perficly spherical

21
Q

what is presbyopia

A

long sited ness with old age

22
Q

what is emmetrope

A

perfected sitedness

23
Q

what happens in myopia in regards to light ways

A

the rays land in front of the retina,

24
Q

cuase of myopia

A

eyeball too long , beinging power of the corna and lens is too powerful

25
Q

what are the common symptoms of myopia

A

heachaes, not being able to see disatn objects
in totlder, loss of interested in sports and more interest in books
may see diverergntes squint in one eye, where the lateral aspect of the syes is used

26
Q

what type of lens is used to correct myopia

A

bi concave

27
Q

what happens to the light rays in hyperopia

A

they converge past the retina

28
Q

cuase of hyperopia

A

the eye ball is too flat/ eyeball to shrot

29
Q

what type of lens for hyperorpia

A

biconvex

30
Q

what are the sympotns of hyperopia

A

eyestrain after reading/ using computre
convergent squins in children

31
Q

what is the cuase of astimagnatism

A

one side of the lens being different to the other lens causing different being of ligh

32
Q

what type of glases are used to treat astigmatis

A

cylindrical glasses

33
Q

what type of contanct lens are use for astigmattism

A

toric lensse

34
Q

what happens to the image in astigmat as it hane siwth diace

A

it does not change - it is still blury

35
Q

what is the cuase of presbyopia

A

age makes the eye less mobile and eyeastic
thus cilary musle not cable to pulling it as much

36
Q

when does presbypia normally occur

A

5th decade of liife

37
Q

what type of lens is used for presboypia

A

biconvex

38
Q

what is bc

A

base curgvature of a glass

39
Q

what is dia

A

diameter of glases

40
Q

what is cyl

A

the amount of cylinger a glasses has, ie how much it fixes astigmatism

41
Q

what is axis

A

shows where the astimagis lies, and at what degree

42
Q
A

CNS (36 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions