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NCLE Test Review > Determine Lens Type and Lens Design Contact Lens Parameters > Flashcards

Determine Lens Type and Lens Design Contact Lens Parameters Flashcards

1
Q
  1. Application of fluorescein should be used in which of the following solutions?

A. Evaluation of gas permeable lens fit
B. Evaluation of soft contact lens parameters
C. Evaluation of vascularization of the cornea
D. Evaluation of gas permeable lens over-refraction

A

Evaluation of gas permeable lens fit

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2
Q
  1. If the diagnostic gas permeable lens placed on the eye results in minimal movement, which of the following will increase the movement on the lens ordered for the patient?

A. Decreasing overall lens diameter
B. Increasing overall lens diameter
C. Increasing optical zone diameter
D. Increasing sagittal depth

A

Decreasing overall lens diameter

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3
Q
  1. Contact lens technicians work with prescriptions in minus cylinder form because:

A. The lacrimal lens is a minus cylinder lens
B. Spectacle lenses are made in minus cylinder form
C. Most phoropters contain only minus cylinders
D. Minus cylinders make it easier to perform retinoscopy

A

The lacrimal lens is a minus cylinder lens

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4
Q
  1. Rx OU: -3.00 -0.50 x 180 Add: +1.25
    If spherical soft lenses are being fit using the monovision technique, what is the desired power for the eye fitted for near?

A. -2.00
B. -3.25
C. +1.25
D. -1.75 -0.50 x 180

A

-2.00

(HINT: find spherical equivalent then calculate Add)

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5
Q
  1. Which of the following lens designs would provide the best visual result for this patient?
    K’s: 43.00 @ 180 / 46.00 @ 090
    Rx: -3.00 DS

A. Soft toric lens
B. Spherical gas permeable lens with increased center thickness
C. Truncated gas permeable lens
D. Soft spherical lens

A

Soft spherical lens

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6
Q
  1. Which edge design is recommended for a +15.00 aphakic GP lens?

A. Hyperflange
B. Lenticular myoflange
C. Concentric design
D. Intrapalpebral design

A

Lenticular myoflange

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7
Q
  1. Which of the following lens designs would provide the best visual result for this patient?
    K’s: 42.00 @ 180 / 42.50 @ 090
    Rx: -3.50 -1.75 180

A. Spherical gas permeable lens
B. Spherical soft lens
C. Soft toric lens
D. Back surface toric gas permeable lens

A

Soft toric lens

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8
Q
  1. What Rx would be ordered for a gas permeable lens fit on K?
    K’s: 43.00 @180 / 44.00 @ 090
    Rx: -3.00 +1.00 x 090

A. -1.00
B. -2.00
C. -3.00
D. -4.00

A

-2.00

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9
Q
  1. To aid in the positioning of a GP prism ballast lens riding too low and slipping underneath the lower lid, which of the following might be helpful?

A. Hyperflange
B. More prism
C. Truncation
D. Thinner edge design

A

Truncation

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10
Q
  1. The following gas permeable diagnostic lens is place on a patient’s eye:
    43.50 -2.00 9.2
    An over-refraction is performed with the following results:
    Plano +1.50 x 095
    Which of the following lens parameters would you order for the patient?

A. 43.50 -0.50-1.50 x 005 9.2
B. 43.50 -2.00-1.50 x 005 9.2
C. 4.50 Plano -1.50 x 095 9.2
D. 43.50 Plano +01.50 x 005 9.2

A

43.50 -0.50-1.50 x 005 9.2

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11
Q
  1. The following soft lens is place on a patient’s eye:
    8.8 -4.00 14.0
    An over-refraction is performed resulting in -0.75 sphere. Which of the following lens parameters would you order for the patient?

A. 8.8 -3.25 14.0
B. 8.8 -4.00 14.0
C. 8.8 -4.75 14.0
D. 8.8 -5.25 14.0

A

8.8 -4.75 14.0

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12
Q
  1. In a GP lens, a poorly finished transitional zone between the optic zone and the lens edge can be evaluated by:

A. Radiuscope
B. Lensometer
C. Profile analyzer
D. Contacto gauge

A

Profile analyzer

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13
Q
  1. During the diagnostic evaluation of the following patient you observe that the lens rotates 10° to the right. Which of the following would you order for the patient?
    Patient’s refraction: -2.50-1.00 x 170
    Diagnostic lens: 8.7 -2.50 -1.00 x 170

A. 8.7 -2.50 -1.00 x160
B. 8.7 -2.50 -1.00 x 170
C. 8.7 -2.50 -1.00 x 180
D. 8.7 -2.50 -1.00 x 010

A

8.7 -2.50 -1.00 x160

(HINT: LARS)

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14
Q
  1. Which of the following lens designs would not provide a good visual result for this patient?
    K’s: 42.50 @ 180 / 44.00 @ 090
    Rx: -2.50 +1.50 x 090

A. Soft toric lens
B. Soft spherical lens
C. Spherical gas permeable lens
D. Aspheric gas permeable lens

A

Soft spherical lens

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15
Q
  1. In prescriptions of 4.00 D or greater, fitting contact lenses requires compensating the power for the change in vertex distance. When moving from the spectacle plane to the corneal plane, the compensated power will be:

A. More plus
B. More minus
C. More plus for plus lenses only
D. More minus for plus lenses only

A

More plus (always)

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16
Q
  1. A prism ballast GP lens requires how much prism for proper orientation?

A. 0.75 - 1.50 D
B. +3.00 D at 6 o’clock
C. 1.50 - 3.00 D
D. always 0.75 D

A

0.75 - 1.50 D

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17
Q
  1. The longer the radius of curvature of a contact lens:

A. The steeper the lens
B. The flatter the lens
C. The larger the diameter
D. The smaller the diameter

A

The flatter the lens

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18
Q
  1. The following soft lens is placed on a patient’s eye:
    8.4 -2.00 14.2
    An over-refraction is performed with the following results:
    -1.00 -0.50 x 174
    Which of the following lens parameters would you order for the patient?

A. 8.4 -2.00 14.2
B. 8.4 -2.75 14.2
C. 8.4 -3.25 14.2
D. 8.4 -3..75 14.2

A

8.4 -3.25 14.2

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19
Q
  1. Given the following information:
    K’s: 45.00 @ 180 / 44.0 @ 090
    Rx: -3.00 +1.00 x 180
    Upper lid positioned at superior limbus.
    Which of the following set of lens specifications would best simulate an intrapalpebral GP lens fit?

A. 43.50 -1.50 8.5
B. 43.50 -1.50 9.5
C. 44.50 -2.00 8.5
D. 44.50 -2.50 8.5

A

44.50 -2.50 8.5

(HINT: Find the spherical equivalent first)

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20
Q
  1. Give the following information, which set of lens specifications would best simulate a lid attachment rigid lens fitting?
    K’s: 42.00 @ 180 / 43.00 @ 090
    Rx: -2.00 -0.87 x 180
    Upper lid positioned 2mm below the superior limbus

A. 41.50 -1.50 9.5
B. 42.50 -2.50 8.5
C. 43.00 -2.50 9.5
D. 43.00 -3.00 8.2

A

41.50 -1.50 9.5

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21
Q
  1. Which of the following bifocal designs represents a translating design?

A. Diffraction design
B. Crescent design
C. Aspheric design
D. Concentric design

A

Crescent design

22
Q
  1. Given the following information, which of the listed rigid lens designs would you order to best correct this wearer’s vision?
    K’s: 42.00 @ 180 / 45.00 @ 090
    Rx: -3.00 -2.25 x 180

A. 42.00 / 45.00 -3.00 -2.25 (Rx form)
B. 42.00 -3.00 -2.75 x 177 prism ballast
C. 42.00 -3.00
D. 45.00 -3.00

A

42.00 / 45.00 -3.00 -2.25 (Rx form)

23
Q
  1. Up until the recent introduction of silicone hydrogel lenses the Dk/t of previous hydrogel lenses was limited by:

A. Water content and center thickness
B. Ionic materials and water content
C. Non-ionic materials and water content
D. Oxygen permeability and wetting angle

A

Water content and center thickness

24
Q
  1. Given the following information, which of the following GP lens designs would you order to best correct this patient’s vision?
    K’s: 45.00 @ 180 / 42.00 @ 090
    Rx: -2.00 -4.25 x 090

A. 45.00 -2.00
B. 42.00 -2.00 -4.25 x 090 prism ballasted
C. 42.00 -2.00
D. 42.00 / 45.00 -2.00/ -5.75 (drum readings)

A

42.00 / 45.00 -2.00/ -5.75 (drum readings)

25
Q
  1. Given the following refraction and K readings, select the correct base curve and power recordings (drum readings):
    Ks: 44.00 @180 / 41.00 @ 090
    Rx: -1.00 -3.00 x 090

A. 41.00 / 44.00 -1.00 / -3.00
B. 41.00 / 44.00 -1.00 / -4.00
C. 41.00 / 44.00 -4.00 / -1.00
D. 44.00 / 41.00 -1.00 / -3.00

A

41.00 / 44.00 -1.00 / -4.00

26
Q
  1. Given the following information, which of the following GP lens designs will best correct this wearer’s vision?
    Ks: 42.50 @ 180 / 42.50 @ 090
    Rx: -3.00 -1.00 x 090

A. Bitoric design
B. Anterior toric design
C. Spherical design
D. Soper cone design

A

Anterior toric design

27
Q
  1. Fitting soft lenses steeper than K will usually result in:

A. Good lens movement
B. A minus tear layer under the lens
C. Fluctuations in vision following the blink
D. Good apical contact

A

Fluctuations in vision following the blink

28
Q
  1. A bifocal lens in which the power gradually changes from the central area of the lens to a periphery is known as:

A. An aspheric lens
B. A juxtapositioned lens
C. A monocentric lens
D. A crescent lens

A

An aspheric lens

29
Q
  1. How many diopters of power will bring parallel rays of incident light to a focus at a distance of one meter?

A. One diopter
B. Two diopter
C. Four diopters
D. Ten diopters

A

One diopter

30
Q
  1. The patient has a horizontal visible iris diameter of 12.5 mm. The best choice for initial soft lens diameter would be:

A. 13.0 mm
B. 13.5 mm
C. 14.5 mm
D. 15.5 mm

A

14.5mm

(HINT: HVID + 2mm)

31
Q
  1. In which of the following types of corneal astigmatism is a GP lens most indicated?

A. Irregular
B. With-the-rule
C. Against-the-rule
D. Oblique

A

Irregular

32
Q
  1. Spherical equivalent powers position which of the following on the retina?

A. Focal plane of the most minus meridian
B. Point focus
C. Focal plane of the most plus meridian
D. Circle of least confusion

A

Circle of least confusion

33
Q
  1. Kertatoconus and penetrating keratoplasty fittings are best accomplished by which of the following methods?

A. Nomogram
B. K’s and Rs
C. Diagnostic fitting
D. Molded impression

A

Diagnostic fitting

34
Q
  1. The following ametropia frequently results in high riding rigid lenses:

A. High myopia
B. High hyperopia
C. Aphakia
D. Presbyopia

A

High myopia

35
Q
  1. A good example of a bifocal contact lens that may rotate without vision impairment is:

A. Aspheric
B. Executive
C. Fused crescent
D. Translating

A

Aspheric

36
Q
  1. A toric soft lens will correct:

A. Residual astigmatism
B. Moderate astigmatism (greater than 2.00 D)
C. Low astigmatism (0.75 - 2.00 D)
D. All of the above

A

All of the above

37
Q
  1. In calculating the prescription for a rigid lens, one must:

A. First transpose the prescription into plus cylinder form
B. First transpose the prescription into minus cylinder form
C. Base the contact lens power on the spherical equivalent
D. Remember to add minus power to the lens to compensated for a negative tear layer

A

First transpose the prescription into minus cylinder form

38
Q
  1. Therapeutic soft lenses should be fit with minimal movement in which case?

A. Keratitis sicca
B. Trichiasis
C. Recurrent erosion
D. Keratoconus

A

Recurrent erosion

39
Q
  1. A rigid lens corrects astigmatism by:

A. Flattening the corneal apex
B. Neutralizing the corneal astigmatism with lenticular astigmatism
C. Flexing just enough to compensate for the patient’s astigmatism
D. Forming a new spherical refracting surface in front of the cornea

A

Forming a new spherical refracting surface in front of the cornea

40
Q
  1. Which of the following is a translating bifocal lens design?

A. Concentric
B. Aspheric
C. Diffractive
D. Segmented

A

Segmented

41
Q
  1. Prism ballast, double slab-off, and peri-ballast are all what type of lens design?

A. Soft toric
B. Bifocal
C. Therapeutic
D. Spherical

A

Soft toric

42
Q
  1. Which of the following are two methods of stabilizing the rotation of rigid bifocal contact lenses?

A. Back surface toric and front surface toric
B. Weights and measures
C. Alternating and translating
D. Truncation and prism ballast

A

Truncation and prism ballast

43
Q
  1. K’s: 42.00 @ 170 / 43.00 @ 080
    Rx: -3.00 -1.00 x 170
    Given the K’s and Rx, the following diagnostic toric soft lens was used:
    8.8 -3.00 -1.00 x 180
    During the diagnostic evaluation the observer notes the lens rotated 10° clockwise.
    The lens ordered should have an axis of:

A. 10°
B. 160°
C. 170°
D. 180°

A

180°

44
Q
  1. The FDA classification for “disposable lenses” means:

A. The lens is disposed of after removal
B. The lens is disposed of after one week
C. The lens is disposed of after two weeks
D. The lens is disposed of after one month

A

The lens is disposed of after removal

45
Q
  1. Given the following information:
    K’s: 42.00 @ 180 / 42.00 @ 090
    Rx: -3.00 -2.00 x 180

A. A back surface toric GP lens will probably be necessary to achieve optimum visual acuity
B. A bitoric toric GP lens will probably be necessary to achieve optimum visual acuity
C. A soft spherical lens will provide the best fit and visual acuity because the patient has a spherical cornea
D. A front surface toric GP will probably be necessary to correct the patient’s residual astigmatism

A

A front surface toric GP will probably be necessary to correct the patient’s residual astigmatism

46
Q
  1. A patient’s K reading are 43.50 @ 180 / 41.50 @ 090. A spherical GP lens can be expected to:

A. Displace down and in, or down and out with each blink
B. Position under the upper lid to provide a superior lid attachment, alignment fit
C. Lock on to the cornea nasally or temporally
D. Establish a fulcrum at 3 and 9 o’clock in the horizontal meridian

A

Displace down and in, or down and out with each blink

47
Q
  1. Which special GP lens design would be beneficial for this patient given the following information?
    K’s: 44.00 @ 180 / 46.50 @ 090
    Rx: -11.00 +2.50 x 090

A. Hyperflange
B. Back toric design
C. Thick edge design
D. Myoflange

A

Hyperflange

48
Q
  1. During the diagnostic evaluation of the following patient you note the lens rotates 10° to your left. Which of the following lens parameters would you order for the patient?
    Patient’s refraction: -3.00 -1.25 x 160
    Diagnostic lens: -3.00 -1.25 x 180 14.5

A. 8.4 -3.00 -1.25 x 160 14.5
B. 8.4 -3.00 -1.25 x 170 14.5
C. 8.4 -3.00 -1.25 x 180 14.5
D. 8.4 -3.00 -1.25 x 010 14.5

A

8.4 -3.00 -1.25 x 170 14.5

49
Q
  1. A patient is diagnostically fit with a gas permeable lens with the following parameters:
    42.50 -3.00 9.5
    If you wish to flatten the lens to cornea relationship, which of the following lenses would you order?

A. 42.00 -2.50 10.0
B. 42.50 -3.00 9.0
C. 43.00 -3.50 9.5
D. 43.50 -3.50 9.0

A

42.50 -3.00 9.0

50
Q
  1. When are soft lenses contraindicated?

A. When the patient has cylindrical keratometric readings
B. When the patient has more than 1.50 D of refractive power
C. When the patient has Grave’s Disease
D. When the patient has irregular corneal astigmatism

A

When the patient has irregular corneal astigmatism

NCLE Test Review (4 decks)

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