Quiz 3

Question 1

Which of the following instruments is best used to check for lens warpage?

a. Profile analyzer
b. Radiuscope
c. Projection magnifier
d. Measuring magnifier

Answer 1

b. Radiuscope

Question 2

If fogging occurs immediately upon insertion of a contact lens:

a. The base curve is too flat
b. The optical zone is too small
c. The lenses were not cleaned properly
d. The base curve is too deep

Answer 2

c. The lenses were not cleaned properly

Question 3

The subjective symptom of edge flare or reflection with a contact lens is aggravated by:

a. Tearing
b. Dry eyes
c. A large P.O.Z.
d. A clear lens

Answer 3

a. Tearing

Question 4

Which of the following need not be recorded on each follow up visit?

a. Subjective and objective findings
b. Keratometry
c. Lens changes and modifications
d. Original Rx and lens specifications

Answer 4

d. Original Rx and lens specifications

Question 5

Peripheral limbal staining at 3 and 9 o’clock is a result of:

a. Viral infection
b. Mechanical erosion by the lens
c. Exposure causing limbal dryness
d. Incorrect insertion

Answer 5

c. Exposure causing limbal dryness

Question 6

A stinging and burning sensation which occurs each day after several hours of wear may be caused by a contact lens which has:

a. None of the above
b. Been improperly cleaned
c. Stagnation of tear fluid behind the lens
d. A flat base curve

Answer 6

c. Stagnation of tear fluid behind the lens

Question 7

Follow up Keratometer readings on an adapted rigid lens wearer should be within _____ from the original readings.

a. 0.30mm
b. 1.50D
c. 1.00D
d. 0.50D

Answer 7

d. 0.50D

Question 8

Lid eversion is necessary to observe which of the following conditions?

a. Keratitis sicca
b. Bullous keratopathy
c. Giant Papillary Conjuctivitis
d. Blepharitis

Answer 8

c. Giant Papillary Conjuctivitis (GPC)

Question 9

Poor vision after contact lenses have been removed and replaced with spectacles is called:

a. Blurring
b. Fogging
c. Contact Lens Blur
d. Spectacle Blur

Answer 9

d. Spectacle Blur

Question 10

A patient complains that the contact lens in his right eye is irritating. Upon slit lamp examination you discover an embedded foreign body. You should:

a. Advise the patient to leave the lens out a few days and return for a check-up
b. Use tweezers to remove the foreign body
c. Send the patient to a doctor
d. Recommend lubrication drops

Answer 10

c. Send the patient to a doctor

Question 11

A contact lens wearer may experience edema of the cornea because of:

a. Poor optics in the lens
b. Absorption of tears into the cornea
c. Over corrections of the lens
d. Under correction of the lens

Answer 11

b. Absorption of tears into the cornea

Question 12

Which of the following should a fitter do when a significant foreign body stain on the cornea is observed during a rigid contact lens follow up visit?

a. Refit with a soft lens
b. Refit with a flatter rigid lens
c. Consult the prescriber
d. Refit with a Therapeutic Lens

Answer 12

c. Consult the presciber

Question 13

Epithelial edema which manifests itself clinically as a grey corneal haze, is verified by the slit lamp using sclerotic scatter illumination. What specific technique does the examiner use to see this condition?

a. High magnification and an angle between the beat and scope of 180 degrees
b. The green filer of the slit lamp with high magnification
c. The blue cobalt filter of the slit lamp and an angle of about 45 degrees
d. The naked eye and an angle between the slit lamp beam and the eye of 45 to 90 degrees

Answer 13

d. The naked eye and an angle between the slit lamp beam and the eye of 45 to 90 degrees

Question 14

Abrasions over the apex of the cornea can be used by:

a. Lens fitting flatter than K
b. Lens constantly rubbing the apex
c. Corneal Edema
d. All of the above

Answer 14

d. All of the above

Question 15

Bubbles trapped under the rigid lens may result in _____ .

a. 3.00 - 9.00 staining
b. Punctate stains
c. Stippling stains
d. Dimple veiling

Answer 15

d. Dimple veiling