1. Interpalpebral rigid lenses are generally fit:

larger and flatter
smaller and steeper
using a tricurve lens design
with segmented multifocals

2. All of the following are advantages of rigid palpebral lenses except:

they can provide good tear exchange
they result in minimal spectacle blur
they are easy to remove
eye movement is free from lids irritation

3. All of the following are advantages of larger "lid attachment" lenses except:

they are ideal for patients with small, steep corneas
the larger optical zone can minimize lens flare
spherical lenses can correct for significant amounts of corneal astigmatism
the lenses are relatively easy to handle

4. High riding lid attachment lenses:

1. can generally correct for up to 3.00 to 4.00 diopters of corneal astigmatism

2. are an excellent design for small, steep corneas

3. can minimize flare due to the larger optic zone

4. can be useful when poor centration is noted with smaller lenses

1, 2, & 4
1, 3, & 4
2, 3, & 4
1, & 3

5. Which of the following would not represent a realistic K reading/lens diameter relationship. Use the Dyer nomogram as a guide.

40.00/41.00/lens diameter: 7.8
42.00/43.00/lens diameter: 9.2
48.25/49.25/lens diameter: 7.7
43.25/44.25/lens diameter: 8.6

6. Which of the following will help determine the best contact lens diameter?

1. corneal topography

2. Dyer Nomogram

3. cornea diameter

4. trial lenses

1, 2, and 3
1, 2, and 4
2, 3, and 4
1, 2, 3, and 4

7. Trial lens evaluation should be used before ordering the lenses since:

they allow for a close estimate of lens size and curvature
lens power can be more accurately determined
the need for any edge modifications can be evaluated
all of the above

8. In evaluating the fit of a rigid lens, apical touch is observed. This would indicate:

a perfect fit
an astigmatic fit
a flat fit
a steep fit

9. Which of the following is not generally used in the fitting of contact lenses?

trial lenses
lensometer
keratometer
slit lamp

10. When evaluating the fit of an RGP lens, dynamic flourescein patterns can be observed:

after the lens has returned to the normal position
when the patient is directing the gaze in a straight ahead position
immediately after the patient has blinked
none of the above

11. Which of the following illuminations is best when evaluating a dynamic flourescein pattern?

fixation light
penlight
cobalt light
indirect light

12. Which of the following would indicate an "ideal" flourescein pattern for a spherical lens on a spherical cornea.

diminished dye in the center with accentuated flourescein under the peripheral curves
an even distribution of flourescein with added thickness under the peripheral curves
intermediate zone touch and a thin peripheral rim
none of the above

13. When "with the rule" astigmatism is present:

the horizontal corneal meridian has the steeper curve
the vertical corneal meridian has the steeper curve
the oblique corneal meridian has the steeper curve
front toric lenses are always indicated

14. A flourescein evaluation of an RGP shows a band-shaped area of touch in the flattest corneal meridian. This would indicate:

a steep fit
an alignment fit
a flat fit
an astigmatic fit

15. A flourescein pattern with a rigid contact lens in place shows a narrow band vertically, with a concentration of flourescein under the lens both nasally and temporally. The type of astigmatism represented by this pattern is:

residual astigmatism
oblique astigmatism
against the rule astigmatism
with the rule astigmatism

16. A good fitting soft contact lens will demonstrate:

adequate movement
good centration
three point touch
all of the above

17. Distortion immediately following each blink is detected when evaluating the fit of a soft contact lens with a retinoscopic reflex. This would be caused by:

a steep fitting lens
a loose fitting lens
a tight fitting lens
a properly fitting lens

18. Rx: OD -3.75 - 50 x 180 This patient is being fit with spherical soft contact lenses. The spherical equivalent is:

-3.00
-3.50
-4.00
-4.50

19. A soft contact lens should be left on the eye for at least ___________ before making a final decision regarding the parameters.

5 minutes
15 minutes
1 hour
2 hours

20. When evaluating the fit of a soft contact lens with a keratometer, distorted mires immediately after a blink would most often indicate:

a steep lens
a flat lens
an ideal fit
none of the above

21. A keratometer is being used to help evaluate the fit of a pair of soft contact lenses. It is observed that the mires are blurry while the lenses are in place. However, after each blink the mires become cleared temporarily, then turn blurry again. This pattern would indicate:

three point touch
a tight fitting lens
a loose fitting lens
an excellent fit

22. A well fitting soft contact lens should demonstrate

1. three point touch

2. good centration

3. adequate movement after the blink

4. edge lift

1 and 2
1, 2, and 4
1, 2, and 3
1, 2, 3, and 4

23. The surface quality and edges of a rigid contact lens can be assesed though the use of a:

profile analyzer
keratometer
burton light
projector inspection device

24. Peripheral curve width, optic zone width, and lens diameter may be inspected through the use of:

keratometer
profile analyzer
measuring hand magnifier
radiuscope

25. Which of the following can be used to measure the optical zone of a rigid contact lens?

a conversion table
a radiuscope
a measuring magnifier
none of the above

26. Which of the following may be used to inspect the quality of the surface of a rigid contact lens?

1. burton lamp

2. measuring magnifier

3. lensometer

4. slit lamp

1 & 3
1, 3, & 4
2, 3, & 4
2 & 4

27. Which of the following cannot be used as an RGP lens inspection device?

radiuscope
lensometer
distometer
diameter gauge

28. Which of the following instruments can be used to inspect RGP lenses?

diameter gauge
radiuscope
lensometer
all of the above

29. Blend and transition zones may be measured using:

hand magnifier
slit lamp
projector inspection device
all of the above

30. A radiuscope is capable of:

1. measuring lens diameter

2. measuring lens power

3. measuring radius of curvature

4. inspecting surface quality

1 & 3
1 & 2
2 & 3
3 & 4

31. The diameter of a rigid contact lens can best be measured by:

lensometer
radiuscope
measuring magnifier
millimeter ruler