CONTACT LENS (HARD&SOFT) (3.0)

Question 1

The test(s) that cannot be used to check the fit of a soft lens is (are)
A. Slit lamp examination
B. Retinoscopy
C. Keratometry over soft lens 
D. Fluorescein pattern
E. None of the above

Answer 1

D. Fluorescein pattern

Question 2

With the blink, a soft lens should move
A. 0.0 – 0.5 mm
B. 0.5 – 1.0 mm
C. 1.0 – 1.5 mm
D. 1.5 – 2.00 mm

Answer 2

B. 0.5 – 1.0 mm

Question 3

Which of the following indicates a tightly fitted hard contact lens?
A. Apical touch
B. Poorly-centered lens
C. Excessive lag
D. Holding head back
E. Burning of the eye

Answer 3

E. Burning of the eye

Question 4

The first modification which should be made to a hard contact lens that rides high is
A. Increase the peripheral curve zone
B. Reduce the overall size
C. Decrease the OZ
D. Thin the edge
E. Chance the base curve

Answer 4

D. Thin the edge

Question 5

What power change can be made to a hard contact lens? 
A. ± 1.75 D
B. ± 0.75 D 
C. ± 3.50 D 
D. ± 2.50 D

Answer 5

B. ± 0.75 D

Question 6

Hard lenses which ride temporally should be replaced by hard lenses with increased
A. Thickness
B. Optical zones
C. Base curve radii
D. Overall diameters
E. Peripheral curve zone
F. Both B and D are correct

Answer 6

F. Both B and D are correct

• B. Opticalzones
• D. Overall diameters

Question 7

The corneal striae (Sarver's folds) have been found more at the
A. Nasal limbus
B. Temporal limbus
C. Corneal apex
D. Inferior limbus

Answer 7

C. Corneal apex

Question 8

Corneal (Descemetes or posterior stroma) striae have been observed more frequently in soft lens patients than in hard lens patients. These striae usually take what type of formation in the cornea?
A. Vertical, uniform diameter
B. Horizontal, tapering at the ends
C. Vertical, tapering at the ends
D. Horizontal, uniform diameter

Answer 8

A. Vertical, uniform diameter

Question 9

Corneal striae of the posterior stroma or Descemetes have been found in long-term wearers of hydrophilic lenses. They have been found to be reversable. It has been postulated that \_\_\_\_\_\_\_\_\_ likely causes this phenomenon.
A. Tears in descemetes 
B. Epithelial erosion 
C. Stroma edema
D. Endothelial striae

Answer 9

C. Stroma edema

Question 10

A soft lens patient can be built up to a full day (14 continuous hours) wearing schedule within
A. 8 days
B. 4 days
C. 10 days 
D. 2 days 
E. 12 days

Answer 10

E. 12 days

Question 11

The pH of a wetting solution should be approximately 
A. 5.0 to 5.8
B. 6.2 to 7.0 
C. 7.8 to 8.6 
D. 7.0 to 7.8

Answer 11

D. 7.0 to 7.8

Question 12

n contact lens solutions, boric acid is typically used as a 
A. Preservative
B. Vasodilator
C. Buffer
D. Cleaning agent 
E. Wetting agent

Answer 12

C. Buffer

Question 13

The commonly used cleaners for hydrocurve soft lenses are
A. Titan
B. Soft-mate
C. Lobob
D. Pliagel
E. All of the above
F. A and C
G. B and D

Answer 13

G. B and D

• B. Soft-mate
• D. Pliagel

Question 14

Normally gel contact lenses are stored in
A. Distilled water
B. 0.9%NaClsolution
C. 1.9% NaCl solution
D. 2.9% NaCl solution
E. 3.9% NaCl solution

Answer 14

B. 0.9%NaClsolution

Question 15

A soft contact lens with radio-opaque markers may be used for the localization of intra-ocular foreign bodies.
A. True
B. False

Answer 15

A. True

Question 16

A presbyopic addition can be obtained in a hard contact lens bifocal by fusing a refractive index of 1.49 for the distance portion and 1.57 for the near portion.
A. True
B. False

Answer 16

A. True

Question 17

For what reason do most patients fail to wear their contact lenses?
A. Poor visual acuity
B. Loss of one or both lenses
C. Discomfort experienced
D. Dislike contact lenses
E. Contact lenses considered too time-consuming
F. Cannot insert and remove by oneself

Answer 17

C. Discomfort experienced