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Clinical Refraction > Light and Refraction > Flashcards

Light and Refraction Flashcards

1
Q

Occurs when light passes from one medium to another of different refractive index

A

Refraction

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2
Q

Responsible for the majority of the refractive power of the eye

A

Cornea

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3
Q

What is the refractive power of the cornea

A

43-44D

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4
Q

A refractive component of the eye that has 20-23D refractive power

A

Crystalline lens

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5
Q

What is the total refractive power of the eye?

A

60-63D

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6
Q

This law states that light rays are focused on the retina because they are refracted by passing through the cornea and lens

A

Snell’s Law

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7
Q

Term for a normal eye

A

Emmetropia

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8
Q

Corneal refractive power is (constant, modifiable)

A

constant

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9
Q

Lens refractive power is (constant, modifiable)

A

modifiable

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10
Q

Axial length of the eye is (constant, modifiable) except under certain conditions

A

constant

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11
Q

A term when a refractive error is present

A

Ametropia

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12
Q

Nearsightedness

A

Myopia

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13
Q

Farsightedness

A

Hyperopia

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14
Q

Curvature of the cornea and/or lens is not spherical

A

Astigmatism

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15
Q

Term used when lens is not spherical

A

Toroidal

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16
Q

The loss of accommodative ability of the crystalline lens

A

Presbyopia

17
Q

Presbyopia is more _____ in nature since it comes with advanced age

A

physiologic

18
Q

Presbyopia is also called as?

A

Short-arm syndrome

19
Q

A refractive power difference of more than 2D between the two eyes

A

Anisometropia

20
Q

A difference of image size between the two eyes as perceived by the patient

A

Aniseikonia

21
Q

Absence of lens

A

Aphakia

22
Q

Phakos means?

A

Lens

23
Q

Artificial lens in the eye

A

Pseudophakia

24
Q

Lens with thin center and thick edges

A

Concave lenses

25
Q

Made up of two prisms aligned apex to apex

A

Concave lens

26
Q

Hallowed center

A

Concave lens

27
Q

Lenses with thick center and thin edges

A

Convex lens

28
Q

Bulging center

A

Convex lens

29
Q

Made up of two prisms aligned base to base

A

Convex lens

30
Q

Concave lenses create what type of images?

A

Virtual and erect

31
Q

Minifies images

A

Concave lens

32
Q

With movement

A

Concave lens

33
Q

Convex lenses create what type of images?

A

Real and inverted

34
Q

Magnifies images

A

Convex lens

35
Q

Against movement

A

Convex lens

Clinical Refraction (4 decks)

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