POST TEST FOR MODULE 35:  Hard Contact Lenses, Part 1        Catalog

                                                                   

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1. How did a PMMA lens get oxygen to the cornea?

A. through "tear pumping" action under the lens

B. PMMA is highly gas permeable

C. the cornea does not have blood vessels, so it does not need oxygen

D. the cornea gets all of its oxygen through the endothelium

2. Contact lens oxygen transmissibility is expressed in terms of:

A. liters per second

B. liters per minute

C. the Dk/L value

D. the Kp/D value

3. Given the following keratometry reading, which is the value of "K"?

    46.00 x 180, 44.00 x 90

A. 45.00

B. 46.00

C. 44.00

D. 90

4. A corneal topographer is used to measure:

A. corneal thickness

B. contact lens parameters

C. the contour of the cornea

D. all of the above

5. Which would be the first step in converting the following refraction to an initial hard contact lens power?

-6.00+1.00x180

A. adjust for vertex power

B. transpose to minus cylinder

C. drop the cylinder power

D. drop the sphere power

6. Given the following refraction, how would a spherical hard contact lens correct the astigmatism?

-6.00+1.00x180

A. the astigmatism would not be corrected, but it would not matter because it is not over 1 D

B. a cylinder correction is ground into the contact lens

C. there is no astigmatism to correct

D. the "tear lens" would correct the astigmatism

7. When discussing hard contact lenses, "SAM" stands for:

A. steeper-add-minus

B. steeper-add-more

C. slow-add-minus

D. slow-add-more

8. The central posterior curve is also known as the:

A. intermediate curve

B. peripheral curve

C. base curve

D. blend

9. RGP lens fitting techniques generally work best with thin lenses.

A. True

B. False

10. Which characteristic would not be typical of an "apical clearance" hard contact lens fit?

A. base curve steeper than "K"

B. the lens centers between the lids

C. blended intermediate and peripheral curves

D. relatively large diameter

11. Which would be a reasonable base curve selection for an RGP "corneal alignment" fit of an eye with the following refraction?

-6.00-1.00x180

A. .75 D steeper than K

B. 2 D flatter than K

C. .5 D flatter than K

D. 1 D steep than K

12.  For the "first time" hard contact lens wearer, it is a good idea to instill a drop of topical anesthetic before the first contact lens insertion.

A. True

B. False

13. For a given base curve, a larger diameter lens will make the lens fit looser.

A. True

B. False

14. Which is an example of "with-the-rule" astigmatism?

A. 44.00 x 90, 44.00 x 180

B. 44.00 x 90, 45.00 x 180

C. 45.00 x 90, 44.00 x 180

D. 44.00 x 45, 45.00 x 135

15. Which hard contact lens power adjustment (from over-refraction results) may not be in the best interest of the 50 year old patient?

A. +1.00 D

B. -0.50 D

C. +0.25 D

D. +0.75 D