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QUESTIONNAIRE VOLUME 2 > CONTACT LENS (HARD&SOFT) (1.0) > Flashcards

CONTACT LENS (HARD&SOFT) (1.0) Flashcards

1
Q
  1. The cornea is thinnest
A. Upon awakening
B. One hour after awakening 
C. During sleep
D. Just prior to sleep
E. One hour prior to awakening
A

D. Just prior to sleep

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2
Q
  1. The water content of a hydrocurve lens is approximately

A. 30%
B. 45%
C. 54%
D. 21%

A

C. 54%

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3
Q
  1. In general, the soft lens is recommended when the

A. Spherical ametropia is between +20 to -20 D
B. Refractive astigmatism is less than 3.00 D
C. Corneal radius is between 39.00
and 49.00
D. Corneal toricity is 2.00 D or less

A

Both A and D are correct

A. Spherical ametropia is between +20 to -20 D
D. Corneal toricity is 2.00 D or less

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4
Q
  1. Which of the following conditions (disorders) prevents hard contact lens wear?

A. Diabetes
B. Allergy
C. Color blindness
D. Asthma

A

Both A and D are correct

A. Diabetes
D. Asthma

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5
Q
  1. Which of the following statements concerning Image size with contact lenses is correct?
    A. The retinal image size is smaller for a myope corrected with contact lenses instead of spectacles
    B. The retinal image size is greater for a myope corrected with contact lenses instead of spectacles
    C. The retinal image size is greater for a hyperope corrected
    with contact lenses instead of spectacles
A

B. The retinal image size is greater for a myope corrected with contact lenses instead of spectacles

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6
Q
  1. Which of the following eye conditions will not prevent hard contact lens wear?
A. Trichiasis 
B. Blepharitis
C. Meibomianitis
D. Chalazion
E. Hordeolum
A

A. Trichiasis

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7
Q
  1. Silicone lenses are highly permeable to

A. Oxygen
B. Carbon dioxide

A

A and B

A. Oxygen
B. Carbon dioxide

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8
Q
  1. Regarding diurnal variation in central corneal curvature, is found that the cornea is

A. Flattest in the morning
B. Steepest in the early evening

A

A and B

A. Flattest in the morning
B. Steepest in the early evening

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9
Q
  1. The plus series soft lens has a front surface radius of

A. 6.2 mm
B. 6.7 mm
C. 7.2 mm
D. 7.7 mm

A

B. 6.7 mm

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10
Q
  1. The hydrogel lens has little or no therapeutic application in which of the following pathological processes?
A. Bullous keratopathy 
B. Keratitis sicca
C. Recurrent corneal ulcers 
D. Epithelial erosion
E. Keratoconus
A

E. Keratoconus

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11
Q
  1. When compared to hard contact lenses, the hydrogel lens offers the distinct advantage of

A. Stabilized visual acuity
B. Durability
C. Reduced adaptation time
D. Minimal spectacle blur

A

Both C and D

C. Reduced adaptation time
D. Minimal spectacle blur

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12
Q
  1. Which of the following factors are enhanced with contact lenses in myopia?
A. Convergence
B. Accommodation
C. Usable field 
D. Aberrations
E. Image size
A

Both C and E are correct

C. Usable field
E. Image size

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13
Q
  1. It is generally accepted that a hard contact lens with a posterior toric surface should be recommended when the corneal
    astigmatism is

A. 0.00 D 0.50 D
B. 0.50 D 1.00 D
C. 1.00 D 2.00 D
D. 2.00 D or more

A

D. 2.00 D or more

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14
Q
  1. Prism ballasted anterior toric hard contact lenses are recommended to correct for internal residual astigmatism when the corneal astigmatism is below

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

A

C. 2.00 D

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15
Q
  1. The normal corneal thickness is approximately
A. 0.32 mm
B. 0.42 mm
C. 0.52 mm
D. 0.62 mm
E. 0.72 mm
A

C. 0.52 mm

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16
Q
  1. The F series soft lens has a
A. Diameter of 13.5 mm
B. Anterior radius of 8.2 mm 
C. Thickness of 0.9 mm
D. Power range from -0.25 to -6.00 
E. None of the above
A

D. Power range from -0.25 to -6.00

17
Q
  1. What method can be used to correct for internal residual astigmatism/greater than 1.00 D when corneal hard contact lenses are used?

A. Toric base curve with an anterior spherical surface
B. Spherical central, anterior, and posterior surfaces
C. Spherical base curve and anterior toric surface

A

Both A and B are correct

A. Toric base curve with an anterior spherical surface
B. Spherical central, anterior, and posterior surfaces

18
Q
  1. The proper procedure required to read the power of a soft lens is to

A. Read the power off the bottle
B. Put the lens directly from the bottle onto the vertometer and take a power reading
C. Dry the lens, wait 10 seconds, and read the power on the lensometer
D. Read the power off the alpascope

A

C. Dry the lens, wait 10 seconds, and read the power on the lensometer

19
Q
  1. Which of the following statements concerning and convergence accommodation through contact lenses is correct?

A. A myope requires less accommodative convergence when corrected by contact lenses
B. A myope requires more accommodative convergence when corrected by spectacle lenses
C. A myope requires more accommodative convergence when corrected with contact lenses

A

B. A myope requires more accommodative convergence when corrected by spectacle lenses

20
Q
  1. The Hydro Curve Contact Lens is made of a material with a refractive index of
A. 1.52 
B. 1.49
C. 1.43
D. 1.39 
E. 1.33
A

C. 1.43

21
Q
  1. When internal residual astigmatism exists only in one eye and is corrected with a prism ballast lens, the other eye must be corrected with the same ballast. Otherwise,

A. The difference in chromatic aberration is annoying
B. Aniseikonia is induced
C. A vertical phoria is induced
D. A horizontal phoria is induced

A

C. A vertical phoria is induced

22
Q
  1. Which of the following must accommodate more with contact lenses than with spectacle lenses?

A. Hyperopes
B. Emmetropes
C. Myopes
D. Aphakics

A

C. Myopes

23
Q
  1. Which of the following six early symptoms require a change in the hard contact lens?
A. Adaptive problems
B. Procedural error by patient 
C. Psychological problems of patient
D. Fitting error
E. None of the above
A

D. Fitting error

24
Q
  1. The flattest series of the B & L Soflens series is

A. B
B. F
C. J
D. N

A

A. B

25
Q
  1. Which of the following calculations are required in order to determine the correct soft lens power?

A. The spherical equivalent
B. The average corneal radius
C. The interval of Sturm

A

Both A and B

A. The spherical equivalent
B. The average corneal radius

26
Q
  1. The average blink rate in women is approximately
A. 19 times per minute
B. 25 times per minute 
C. 14 times per minute
D. 10 times per minute
E. 5 times per minute.
A

C. 14 times per minute

27
Q
  1. Soft lenses are contraindicated in

A. Early stages of pregnancy
B. Acute inflammations of the anterior segment of the eye
C. Corneal hypoesthesia

A

All of the above

A. Early stages of pregnancy
B. Acute inflammations of the anterior segment of the eye
C. Corneal hypoesthesia

28
Q
  1. Plastics used in soft contact lenses belong to a class of materials called polymers of

A. High molecular weight
B. Low molecular weight
C. Both A and B

A

A. High molecular weight

29
Q
  1. Which of the following factors are increased with contact in hyperopia?

A. Manifest convergence
B. Image size
C. Aberrations
D. Accommodation in reserve

A

E. Both A and D are correct

A. Manifest convergence
D. Accommodation in reserve

30
Q
  1. Vertical phorias up to what amount can be corrected with prism corneal hard contact lenses?

A. 1 prism diopter
B. 2 prism diopters
C. 3 prism diopters
D. 4 prism diopters

A

C. 3 prism diopters

31
Q
  1. Which of the following conditions is best corrected by hard contact lenses?

A. Aniseikonia related to axial anisometropia
B. Lateral phoria
C. Aniseikonia related to refractive anisometropia
D. Vertical phoria

A

C. Aniseikonia related to refractive anisometropia

32
Q
  1. The material that soft lenses are made of is

A. HEMA
B. PMMA
C. Poly (2-hydroxyethyl methacrylate)
D. Polymacon

A

A, C, and D

33
Q
  1. The steepest series in the B & L Soflens series is

A. B
B. F
C. J
D. N

A

D. N

34
Q
  1. At what minimum age should contact lenses be typically considered?

A. 6 years
B. 10 years
C. 4 years
D. 13 years

A

A. 6 years

35
Q
  1. Which of the following conditions will be helped by wearing hard contact lenses?
A. Glaucoma
B. Iridocyclitis
C. Pterygium
D. Old inactive case of trachoma
E. Keratoconus
A

Both D and E are correct

D. Old inactive case of trachoma
E. Keratoconus

36
Q
  1. The water content of the B & L Soflens is approximately
A. 29% 
B. 32%
C. 39% 
D. 42%
E. 49%
A

C. 39%

37
Q
  1. Tap water may be used to rinse soft

A. Hydrophilis type lenses
B. Silicone lenses

A

B. Silicone lenses

38
Q
  1. Silicone lenses are

A. Hydrophobic
B. Hydrophilic
C. Neither A nor B

A

A. Hydrophobic

QUESTIONNAIRE VOLUME 2 (9 decks)

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