Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

NCLE Prep > Test Reviews Part 4 > Flashcards

Test Reviews Part 4 Flashcards

1
Q

Which of the following can NOT be used to measure the diameter of a rigid lens?
a) Profile analyzer
b) Measuring magnifier
c) Diameter gauge
d) Shadowgraph

A

a) Profile analyzer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Use of a Wratten # 12 or Tiffen yellow filter is important in evaluating the fluorescein pattern of patients with
RGP lenses because:

A

Many patients are wearing lenses containing UV inhibitors that block fluorescein

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

If fluorescein evaluation reveals apical staining, it could be due to:
a) A lens that is too flat and loose
b) A lens that is too steep and tight
c) Corneal edema
d) All of the above

A

d) All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

If an RGP lens fails to provide acceptable visual acuity, the fitter should first

A

Have a sphero-cylindrical over-refraction performed to see if the reduced acuity is due to residual astigmatism

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

According to the FDA, disposable contact lenses that are removed nightly, should be discarded after

A

2 weeks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Circumcorneal. injection in a soft lens wearer may be a sign of:

A

a) Tight lens syndrome
b) Solution sensitivity
c) Keratitis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

A technician can perform a preliminary evaluation of soft contact lens movement by:

A

a) Observing the movement of the lens edge in relation to the position of a conjunctival vessel
b) Having the patient look up and blink
c) Observing movement and lens lag in upward and lateral gaze with a penlight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which of the following statements concerning lens movement is not correct:
a) A tight lens may cause blanching of the limbal vessel
b) A tight lens may cause scleral indentation
c) A loose lens may cause blurred vision immediately following the blink
d) A loose lens will be considerably more comfortable than a tight lens

A

The answer is D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Which of the following modifications to a rigid gas permeable lens can not be made in the office?
a) Blending of peripheral curves
b) Addition of minus power
c) Polishing lens surface
d) Changing the base curve

A

d) Changing the base curve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q
  1. In-office polishing of the anterior surface of a rigid gas permeable lens surface will provide many benefits to the
    patient. Which of the following is not a benefit of polishing the lens in the office?
    a) Cleaner lens surface
    b) Increased lens comfort
    c) Thinner lens edge
    d) Removal of scratches on the lens surface
A

c) thinner lens edge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the most important feature of an in-office modification unit?

A

Variable speed motor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The “watermelon seed” principle relies on the pressure of the upper lids to maintain the correct orientation of a prism
ballasted toric lens and keep it from rotating off axis. In an exophthalmic eye, the retracted lids are unable to grasp the
edge of the lens to maintain its orientation. The lens will generally not be expelled forcibly but may dehydrate, shrink
and fall out spontaneously.

A

If a patient with exophthalmic eyes due to thyroid disease requires a toric lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which of the following is not characteristic of corneal edema?
a) Smoky vision
b) Spectacle blur
c) Increase in K readings
d) Peripheral flare

A

d) peripheral flare

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Which is used when blending peripheral curves in the office?

A

Radius tools
Polishing compound
Suction cups or a spinner tool

not the slot gauge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

When keratometric mires reflected off a soft contact lens are only clear when the wearer blinks, the lens fit is
too:
a) Small
b) Large
c) Steep
d) Flat

A

c) steep

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Gross corneal edema, which manifests itself clinically as central corneal haze, is verified by the slit lamp using
sclerotic scatter illumination. What specific technique does the examiner use to see this condition?

A

The naked eye and an angle between the slit lamp beam and the eye of 90 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

When inspecting the blend on the bevel of an RGP lens, An ideal blend should show a …

A

J-shaped or ski pattern in a smooth curve

18
Q

Diffuse central punctate staining is an indication of:

A

tight lens

19
Q

Sandy returns to your office after being fit with soft contact lenses. She has complaints of the lenses becoming
uncomfortable and burning as the day progresses. What might be the reason?

A

The lens is too tight

20
Q

With a rigid contact lens in place, a fluorescein pattern shows a concentration of fluorescein inferiorly and
superiorly beneath the lens. Which one of the following types of astigmatism is represented by this pattern?

A

With-the-rule astigmatism

21
Q

Fluorescein will be absent or minimal where the cornea is flatter and pool or collect where the cornea is steeper

A

true

22
Q

check 164

A

164

23
Q

Corneal edema is observed inferiorly under a prism ballast toric soft lens. What is the probable cause?

A

Prism thickness is too great this lens

24
Q

A soft lens has edge lift when observed on a cornea. How can this be corrected?

A

Steepen the base curve

25
Q

In evaluating a soft lens with either keratometry mires or retinoscopic reflex, you detect distortion immediately
after the blink followed by clear mires. This is caused by

A

A flat fitting lens

26
Q

FDA Group … lenses have a negatively charged surface that attracts positively charged tear film, proteins and
lipids

A

IV

27
Q

Which type of slit lamp illumination is used for observing tear break up time?

A

Diffuse illumination

28
Q

A non-wetting rigid gas permeable lens may cause:

A

Hazy, filmy vision
Lens awareness
Dryness or grittiness

29
Q

1) Pressure exerted by the upper lid
2) High Dk Lens material
3) Apical clearance lens design
4) Against the rule corneal toricity

A

Causes of lens flexure may include

30
Q

When evaluating fluorescein patterns, a special filter must be used with:

A

Polymers with a UV blocker

31
Q

Which of the following could cause a patient’s rigid contact lens to displace frequently and pop out without
cause?

A

Excessive posterior peripheral curve
Flat base curve relationship

32
Q

Among the following choices, which is the latest lens design for keratoconus?

A

Rose K design

33
Q

A soft contact lens that is too loose may show all of the following EXCEPT:

A

Limbal compression

34
Q

A patient with a high degree of with-the-rule astigmatism fitted with a spherical rigid gas permeable lens will
show touch

A

On the horizontal meridian

35
Q

A rigid lens showing apical touch is an indication of:

A

A flat fit

36
Q

A rigid lens showing excessive apical pooling is an indication of

A

A steep fit

37
Q

Contact lenses that have a non-spherical back surface are called

A

Aspheric lenses

38
Q

A rigid lens showing central vaulting is indicative of:

A

Apical clearance fit

39
Q

A rigid lens showing a band-shaped area of touch on the flattest meridian is an indication of

A

An astigmatic fit

40
Q

When there is a slight pooling of fluorescein in the peripheral curve portion of a rigid lens, it indicates:

A

slight edge lift

NCLE Prep (26 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions