GRADED A+
✔✔Causes of lens flexure may include:
1 pressure exerted by the upper lid
2 lens material
3 apical clearance lens design
4 against the rule corneal toricity
a. 1 and 3
b. 2 and 4
c. 2 only
d. all of the above - ✔✔d. all of the above
✔✔The FDA has recommended that extended wear contact lenses be worn for a
maximum of:
a. 7 days
b. 14 days
c. 30 days
d. 45 days - ✔✔a. 7 days
✔✔Therapeutic soft lenses should be fit with minimal movement in which case?
a. Keratitis sicca
b. Trichiasis
c. Recurrent erosion
d. Keratoconus - ✔✔c. Recurrent erosion
✔✔An aphakic patient with K readings of 40.50 @ 180/41.25 @ 90, large palpebral
fissures and flaccid lower lids is a good candidate for
a. a one cut
b. a myoflange lenticular
c. a hyperflange lenticular
d. a back toric - ✔✔b. a myoflange lenticular
✔✔The CPC of a rigid lens was ordered 7.84mm and was received measuring 7.94mm.
This lens is _____ than ordered.
a. 0.50D steeper
b. 1.00D flatter
c. 0.50 flatter
d. 1.00D steeper - ✔✔c. 0.50 flatter
, ✔✔When evaluating fluorescein patterns, a special filter must be used with
__________.
a. Silicone acrylate
b. Polymethylmethacrylate
c. Fluropolymers
d. Hydroxyethyl methacrylate - ✔✔c. Fluropolymers
✔✔When comparing high DK silicone acrylate polymers to earlier generation materials
of the same type, the new "improved" silicone acrylates
1 increase oxygen permeability
2 flex less
3 have poorer wetting characteristics
4 scratch less
a. 1 only
b. 1 and 3
c. 2 and 4
d. all are correct - ✔✔b. 1 and 3
✔✔A normal fitting soft contact lens will have:
a. three point touch (apex and periphery)
b. apical clearance
c. edge stand-off
d. none of the above - ✔✔a. three point touch (apex and periphery)
✔✔The keratometer is an instrument used to measure
a. Corneal curvature
b. Lens power
c. Lens diameter
d. Lens thickness - ✔✔a. Corneal curvature
✔✔A lens fitted for keratoconus should:
a. Flatten the apex
b. Ride high
c. Align the apex
d. Ride low - ✔✔c. Align the apex
✔✔A soft contact lens which is too loose can show all the following EXCEPT:
a. edge stand-off