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Written Optical Exam > Contact Lens 2.0 > Flashcards

Contact Lens 2.0 Flashcards

1
Q

In contact lenses each 0.5 mm radius is equivalent to about ______ D.

A

2.5

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2
Q

A front toric contact lens is indicated primarily for?

A

Lenticular astigmatism

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3
Q

Which layer of the tear film helps to retard evaporation?

A

Lipid

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4
Q

A contraindication for fitting contact lenses is:

A

Keratitis sicca (dry eye where cornea is inflamed)

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5
Q

A property of plastic which is a disadvantage for its use in contact lenses is:

A

Hydrophobic

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6
Q

The space between the upper and lower lids is called the:

A

Palprebral fissure

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7
Q

A monocular complaint with a contact lens is most likely due to:

A

Poor edge

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8
Q

Poor vision with glasses after contact lenses have been removed is called?

A

Spectacle blur

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9
Q

All contact lens modifications tend to:

A

Loosen the lens fit

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10
Q

If the base curve of a contact lens is 45.00 D, the posterior peripheral curve would be about:

A

26.00 D (peripheral curve on a rigid contact lens is about 20.00 D flatter than the base)

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11
Q

A rigid lens showing apical pooling indicates:

A

Tight fit

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12
Q

The optic spherometer verifies primarily what contact lens parameter?

A

Base curve (another name for radiuscope)

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13
Q

Arc staining occurs primarily because of:

A

Sharp juncture between the blends

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14
Q

A localized area of corneal thinning usually at the limbus caused by excessive dehydration is called a :

A

Dellen

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15
Q

What is a veruccae?

A

Benign eye lid tumor

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16
Q

What is a arcus senilus?

A

Grey band at the limbus in many older people

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17
Q

The chemist who invented HEMA is:

A

Wichterle

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18
Q

Tears on the front of a contact lens is called?

A

The pre-corneal film

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19
Q

The largest layer of the cornea is:

A

Stroma

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20
Q

What will enhance the viewing of neo-vascularity/

A

Red free filter

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21
Q

If a profile analyzer is not available to evaluate the blend quality of a rigid lens, what else can be used?

A

Overhead fluorrescent tubes

22
Q

A mosaic pattern observed on the cornea with fluorescein might be from:

A

Eyelid rubbing

23
Q

Which of the following rigid lens parameters is not under the control of the fitter?
A:posterior radius B. Peripheral Posterior Curve C. Intermediate Posterior Curve D. Central Anterior curve E. CN Bevel

A

D

24
Q

A grayish band that surrounds the cornea in some people is called the?

A

arcus senilis

25
Q

The index of refraction of the cornea is:

A

1.37

26
Q

The index of refraction of the aqueous or vitreous is:

A

1.33

27
Q

The index of refraction of PMMA is :

A

1.49

28
Q

The index of refraction of crown glass is:

A

1.523

29
Q

The index of refraction of many soft lenses is:

A

1.43

30
Q

Corneal inflammation due to a tear deficiency is:

A

Keratitis Sicca

31
Q

Devitalized cells stain with?

A

Rose Bengal

32
Q

The keartometer interprets the cornea as:

A

A sphere and a small convex mirror

33
Q

The optic zone of most corneas is between:

A

5.8-6.2 mm

34
Q

What is the typical adjustment period for a new RGP wearer?

A

1-2 weeks

35
Q

When fitting monovision contact lenses the near eye is usually:

A

The non dominant eye and given as little ADD as possible

36
Q

A disease commonly associated with a tear deficiency is

A

Rheumatoid arthritis

37
Q

What slit-lamp illumination is used to verify tear break up time (TBUT)?

A

Diffuse

38
Q

The following ametropia frequently results in high riding lenses:

A

-12.00

39
Q

Corneal sensitivity is usually reduced when:

A

After cataract surgery

40
Q

A topogometer is an attachment to the?

A

the ophthalmometer (AKA keratometer)

41
Q

A Burton lamp is:

A

Used to evaluat fluorescein patterns (a hand held device)

42
Q

Soft lenses should be inserted:

A

On the inferior sclera

43
Q

Agents that destroy, neutralize or inhibit growth of pathogenic organisms on contact lenses are called?

A

Preservatives

44
Q

Which slit lamp illumination can be done without the aid of the microscope?

A

Sclerotic Scatter

45
Q

Oxygen is delivered to the cornea by the?

A

Precorneal film

46
Q

The bacteria killing ingredient found in the tear film is:

A

Lysozyme

47
Q

What is usually ground on a minus rigid contact lens when lenticulation is not necessary?

A

CN bevel

48
Q

What modification cannot be performed on a rigid contact lens?

A

Make the peripheral curves steeper

49
Q

Transient keratometric mire distortion is usually due to?

A

Pre-ocular tear film

50
Q

Development of new blodd vessels in the cornea is called?

A

Neovascularization

51
Q

A rigid lens showing apical touch indicates a fit that is?

A

Flat

Written Optical Exam (2 decks)

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