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Abo > Anatomy > Flashcards

Anatomy Flashcards

0
Q

The refractive power of a crystalline lens is

A

17 diopter a

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1
Q

The refractive power of a cornia

A

43.00 diopter a

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2
Q

The space between the back of the cornea and iris is

A

Anterior chamber

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3
Q

The space between the iris and lens is

A

Posterior chamber

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4
Q

The largest space between the lens and retina is called

A

Vitreous chamber

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5
Q

The five layers of the cornea are in order

A

Epithelium, bowmans membrane, stroma, des meets membrane, endothelium

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6
Q

What part of the retina deals with day vision, details and color

A

Cones

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7
Q

What part of the cornea deals with night vision, peripheral vision and black and white

A

Rods

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8
Q

The largest part of the cornea is the

A

Stroma, 90%

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9
Q

The index of refraction of the cornea is

A

1.37

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10
Q

The index of refraction of the vitreous humor and the aqueous humor is

A

1.33 each

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11
Q

The index of refraction of the crystalline lens is

A

1.42

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12
Q

The outer protective coating of the eye that consists of the sclera and cornea is

A

Fibrous tunic

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13
Q

Consists of three parts…the iris, ciliary body and the choroid

A

Vascular tunic

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14
Q

What tunic consists of the retina

A

Neural tunic

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15
Q

What three things happen during accommodation

A

Ciliary muscle relaxes allowing crystalline lens to relax, eyes converge, pupils constrict

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16
Q

A constant tendency for the eyes to turn from the normal position for binocular vision is

A

Phoria.

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17
Q

A definite and obvious turning of the eye from the normal position for binocular vision is

A

Tropia

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18
Q

A tendency of the right eye to turn upward is

A

Right exophoria…. Exo is out

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19
Q

A definite turning inward of the left eye is

A

Left esotropia. Eso..in

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20
Q

A tendency of the right eye to turn upward is

A

Right hyper phobia…hyper is up

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21
Q

A definite turning downward of the left eye

A

Left hypotropia. Hypo is down

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22
Q

The extra ocular muscles are inserted into the sclera and serve to rotate the eye in all directions. There are how many muscles in each eye

A

6

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23
Q

Fusion occurs where?

A

In the brain

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24
Q

The ability of the eye to bring objects of varying distances to focus on the retina is called

A

Accommodation

25
Q

When accommodation is at rest, rays of light from a distant source come into focus in front of the retina. This condition is known as

A

Myopia

26
Q

When accommodation is at rest , rays of light from a distant source come into focus in front of the retina. This condition is known as

A

Hyperopia

27
Q

The loss of vision without any apparent disease of the eye is

A

Amblyopia

28
Q

Refractive error in the eye, when at rest, does not focus the image of an object upon the retina, includes hyperopia, myopia and astigmatism

A

Ametropia

29
Q

A condition in which the ocular image of an object as seen be one eye differs so much in size or shoe from that seen by the other eye that the two images cannot be fused into a single impression

A

Aniskeikonia

30
Q

A condition in which the refractive error of one eye significantly differs from that of the other, each eye must have the same sign

A

Anisometropia

31
Q

A refractive condition whereby the signs in each eye are opposite, one eye is myopic and the other is hyperoptic

A

Antimetropia.

32
Q

Absence of the crystalline lens

A

Aphakia

33
Q

The clear watery fluid that fills the anterior and posterior chambers within the front of the eye

A

Aqueous humor

34
Q

Refractive error that prevents the light rays from coming to a single focus on the retina because of various degrees of refraction in the various meridians of the eye

A

Astigmatism.

35
Q

Condition where the crystalline lens becomes opaque with consequent loss of visual acuity

A

Cataract

36
Q

The vascular inermedate coat that furnishes nourishment to other parts of the eyeball

A

Choroid

37
Q

The refractive error which results in two points of focus falling behind the retina

A

Compound hyperoptic astigmatism

38
Q

The refractive error which results in two points of focus falling in front of the retina

A

Compound nay optic astigmatism

39
Q

The seeing of one object as two or double vision

A

Diplopia

40
Q

The refractive condition of the normal eye at rest in which the image of distant objects is brought to a focus on the retina. No accommodation needed

A

Emmetropia

41
Q

The small depression in the retina in the back of the eye, the part of the macula most adapted for acute vision

A

Fovea

42
Q

The ocular disease of sustained intraocular pressure that the eye cannot withstand without damage to its structure or impairment of its function

A

Glaucoma

43
Q

The refractive error, because the eyeball is short or the refractive power of the lens is weak, the point of focus for rays of light from distant objects falls behind the retina, accommodation to increase refractive power of the lens is necessary for distance as well as near

A

Hyperopia

44
Q

The colored part of the eye that regulates the amount of light entering the eye by changing the size of the pupil

A

Iris

45
Q

Refractive condition caused by a damaged cornea where the rays of light come to many focal points on the retina. Not correctable

A

Irregular astigmatism

46
Q

Spectacle lenses designed to manipulate image size when dissimilar sizes make it difficult or impossible for fusion to occur, such as in aniseikonia

A

Iseikonic lenses

47
Q

The small area of the retina that surrounds the fovea and with the fovea comprises the area of the retina that gives distinct vision

A

Macula

48
Q

The refractive condition in which light comes to two points of focus where one is in front of the retina and the other is behind the retina

A

Mixed astigmatism

49
Q

A refractive error in which the eyeball is too long in relation to its focusing power, thus the point of focus falls in front of the retina

A

Myopia

50
Q

The special nerve of the sense of sight that carries impulses from the retina got the brain

A

Optic nerve

51
Q

The gradual lessening of the power of accommodation due to a physiological change that becomes noticeably apparent about the age of 40

A

Presbyopia

52
Q

A small spring wire attached nasally to a spectacle frame to lift a drooping lid

A

Ptosis crutch

53
Q

Condition in which rays of light come to two focal points and is correctable

A

Regular astigmatism

54
Q

The white part of the eye. Tough covering which, with the cornea, forms the external protective coating of the ye

A

Sclera

55
Q

The transparent colorless mass of soft, gelatinous material filling the eyeball behind the lens

A

Vitreous humor

56
Q

Failure of the two eyes to simultaneously direct their gaze at the same object because of muscle imbalance. Also known as squint

A

Strabismus

57
Q

Refractive condition where one point of focus falls on the retina and the other falls behind the retina

A

Simple hyperoptic astigmatism

58
Q

The refractive condition where one point of light falls on retina and the other falls in front of the retina

A

Simple myopic astigmatism

59
Q

The average person blinks how many times per minute

A

7 to12

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