CONTACT LENS (HARD&SOFT) (3.0) Flashcards
1
Q
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
A
D. Fluorescein pattern
2
Q
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
A
B. 0.5 – 1.0 mm
3
Q
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
A
E. Burning of the eye
4
Q
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
A
D. Thin the edge
5
Q
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
A
B. ± 0.75 D
6
Q
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
A
F. Both B and D are correct
- B. Opticalzones
- D. Overall diameters
7
Q
The corneal striae (Sarver's folds) have been found more at the A. Nasal limbus B. Temporal limbus C. Corneal apex D. Inferior limbus
A
C. Corneal apex
8
Q
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
A
A. Vertical, uniform diameter
9
Q
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
A
C. Stroma edema
10
Q
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
A
E. 12 days
11
Q
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
A
D. 7.0 to 7.8
12
Q
n contact lens solutions, boric acid is typically used as a A. Preservative B. Vasodilator C. Buffer D. Cleaning agent E. Wetting agent
A
C. Buffer
13
Q
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
A
G. B and D
- B. Soft-mate
- D. Pliagel
14
Q
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
A
B. 0.9%NaClsolution
15
Q
A soft contact lens with radio-opaque markers may be used for the localization of intra-ocular foreign bodies.
A. True
B. False
A
A. True
