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Final Review > CL Review > Flashcards

CL Review Flashcards

1
Q

A diffuse throws out a large illumination. This is good for general survey of the cornea.

t/f

A

true

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2
Q

Direct illumination is used for a sharp focus of 2mm or less.

t/f

A

true

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3
Q

A 1-2mm beam gives a parallel piped section that separates the anterior and posterior cornea.

t/f

A

true

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4
Q

A narrow slit, called an optical section, allows the observer to see individual layers of a transparent structure.

t/f

A

true

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5
Q 
Direct illumination is best used for...
opacities 
endo deposits
scratches on the lens surface
all of the above
A

all of the above

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6
Q

Optical section is used to determine which layer of the cornea is involved, detect irregular topography, and to view the lens/cornea relationship.

t/f

A

true

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7
Q

Specular reflection is used for detecting hazy lenses, fine epithelial edema, endo cells, and the surface of the crystalline lens.

t/f

A

true

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8
Q

Indirect beam is very useful for inspecting opaque structures such as lids and lashes, scleara and conjunctiva.

t/f

A

true

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9
Q

Retro is used for viewing corneal vascularization and scarring, edema and myocists, deposits on the contact lens or cornea.

t/f

A

true

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10
Q

Sclerotic Scatter produces a halo effect, and is used for detecting opacities, central corneal clouding or patch edema.

A

true

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11
Q

Keratometer mires, va, and retinoscopy reflex blurry but clear immediatly after blink indicates a ____ fit.
loose
tight
well

A

tight

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12
Q

Circumcorneal injection and indention and good initial comfort are a indication of a ____ fit
well
tight
loose

A

tight

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13
Q

Poor centration, excessive movement, and edge stand off are an example of a ____ fit.
tight
loose
well

A

loose

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14
Q

Keratometer mires, va, and retinoscopy reflex clear but blur immediately after blink is an example of a ____ fit.
loose
tight
well

A

loose

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15
Q

With the rule, flattest K at 90

t/f

A

true

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16
Q

Flattest K at 90 is ATR.

t/f

A

true

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17
Q

Oblique is flattest k between 30 and 60 or 120 and 150.

t/f

A

true

18
Q

Irregular is when the flattest and steepest meridians are noticeably more or less 90 apart.

t/f

A

true

19
Q

Lenticular/internal astigmatism is created by a surface other than the anterior surface of the cornea.

t/f

A

true

20
Q

Total/refractive astigmatism found in the spectacles rx.

t/f

A

true

21
Q

Residual astigmatism is wha remains after a contact lens is fit to the cornea.

t/f

A

true

22
Q

Calc. residual astig.

A
  1. Determine the amount and type of astig.
  2. with the rx in (-) cyl, determine amount and type of refractive astig.
  3. If they’re the same, subtract. If they’re opposite, add.
23
Q

If we find more than 1.00D of residual astigmatism, the pt will usually require a front surface toric lens.

t/f

A

true

24
Q

If the flattest and steepest meridians differ by more than 3.00D, the pt will usually require a back surface or bitoric design.

t/f

A

true

25
Q

Peripheral limbal staining at 3:00 and 9:00 is a result of exposure causing limbal dryness.

t/f

A

true

26
Q

A contact lens wearer may experience edema of the cornea because of a absorption of tears into the cornea.

t/f

A

true

27
Q

The subjective symptom of edge flare or reflection with a contact lens is aggravated by tearing.

t/f

A

true

28
Q

A stinging and burning sensation which occurs each day after several hours of wear may be caused by a contact lens which has a stagnation of fluid build up behind the lens.

t/f

A

true

29
Q

A ______ is used to check for lens warpage.

radiuscope
lensometer
measuring magnifer

A

measuring magnifer

30
Q

If fogging occurs immediatly upon insertion, the lenses were not cleaned properly.

t/f

A

true

31
Q

Bubbles trapped under a rigid lens may result in _____.

dimple veiling
stippling stains

A

stippling stains

32
Q

F/U K readings on an adapted rigid lens should be with-in ____ from the original readings.
.50
1.00
.75

A

.50

33
Q

Rose K is the latest design for keratoconus.

t/f

A

true

34
Q

A patient has a possible acuity of 20/25 but has anaridia and photophobia, would a opaque cosmetic lens with optics be used?

t/f

A

true

35
Q

Corneal scars benefit from an X-chrom or Ruby Red lens.

t/f

A

true

36
Q

A prism ballast RGP lens requires 0.75-1.50D prism for proper orientation.

t/f

A

true

37
Q

Prism ballast, double slab off, and peri ballast are all used for soft toric lens designs.

t/f

A

true

38
Q

A segmented is an example of a translating bifocal design.

t/f

A

true

39
Q

A bifocal lens where the power gradually changes from the central area of the lens to the periphery is known as an aspheric lens.

t/f

A

true\

40
Q

When fitting a rigid back surface toric, appox. _____ % of the corneal toricity may be placed on the posterior lens surface.
75
66
50

A

66%

41
Q

What type of illumination is best used for checking lens postion & movement, TBUT, corneal staining, and blinking reflex?
Diffuse
direct
sclerotic

A

diffuse

Final Review (3 decks)

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