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Optics > z EBOD > Flashcards

z EBOD Flashcards

1
Q

The refractive index of the lens is

A

14,2

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2
Q

The refractive index of the cornea is

A

1.377

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3
Q

The refractive index of the aqueous humour is

A

1.3374

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4
Q

The two surfaces of the cornea have radii of curvature of

A

+7.8 mm and +6.5 mm

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5
Q

myopic eye - more or less refractive power

A

more

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6
Q

myopic - The near point is further or closer

A

closer

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7
Q

myopic - amplitude of accommodation is more or less

A

less

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8
Q

Myopia is corrected with

A

diverging, concave or negative lenses

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9
Q

Myopia - prevalence

A

10-15%

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10
Q

Different types of hyperopia

A

axial, index, and curvature or refractive

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11
Q

how many newborns are hyperopic

A

75-80%

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12
Q

with the rule

A

most common, vertical steepest near 90 st, children

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13
Q

In with-the-rule astigmatism - where is too much + cylinder

A

the eye has too much “plus” cylinder in the horizontal axis relative to the vertical axis

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14
Q

with the rule - beams of light focus in front

A

Vertical beams of light focus in front (anterior) to horizontal beams of light

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15
Q

with the rule - how to correct

A

using spectacles which have a “minus” cylinder placed on this horizontal axis

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16
Q

against-the-rule astigmatism - how to correct

A

“plus” cylinder is added in the horizontal axis (or a minus cylinder in the vertical axis).

17
Q

Oblique astigmatism

A

the steepest curve lies in between 120 and 150 degrees and 30 and 60 degrees

18
Q

Irregular astigmatism

A

principal meridians are not perpendicular

19
Q

Prisms - lower or higher refractive index than the air

A

higher

20
Q

If a light ray travels into a medium with a higher refractive index, the angle of refraction will be larger or smaller

A

smaller than the angle of incidence

21
Q

Myopia is corrected with

A

convex lens (plus jak X)

Optics (2 decks)

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