POST TEST FOR MODULE 46:  Refractometry, Basic Techniques    Catalog

                                                                   

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1. Which statement is not true of the auto-refractor?

A. It can take longer to obtain an auto-refractor reading than it does to perform retinoscopy.

B. All auto-refractors also provide keratometry readings.

C. Auto-refractors usually provide reliable results.

D. An auto-refractor can be "fooled" by a small pupil or a cataract.

2. Which statement is true of retinoscopy as compared to an auto-refractor?

A. Retinoscopy is usually more accurate than the auto-refractor.

B. Retinoscopy is easier to perform than an auto-refraction.

C. The retinoscopist can "see" the optical quality of the eye being scoped.

D. A good technician can also obtain K readings while using the retinoscope.

3. What refractive information does the keratometer not give you?

A. the approximate cylinder power

B. the approximate cylinder axis

C. the approximate sphere power

D. the diopter power of the cornea

4. Given the following K readings, which notation regarding corneal astigmatism would be correct?

K1: 44.50 x 45   K2: 43.25 x 135

A. - 1.50 x 135

B. + 1.25 x 135

C. - 1.25 x 45

D. - 1.25 x 135

5. The patient has a glasses correction of -2.00+3.00x90 in each eye, and her vision is 20/20 with each eye.  You can assume that this is an accurate glasses correction.

A. True

B. False

6. In order to get an accurate reading of the cylinder axis, the phoropter must always be level.

A. True

B. False

7. The standard order of testing for refractometry is:

A. sphere power, cylinder power, cylinder axis, refine sphere power

B. cylinder axis, cylinder power, sphere power, refine sphere power

C. cylinder power, cylinder axis, sphere power, refine sphere power

D. sphere power, cylinder axis, cylinder power, refine sphere power

8. On initial testing, your patient has best-corrected distance vision of 20/80.  For your initial sphere check, you will use increments of:

A. .12 diopters

B. .25 diopters

C. 25 diopters

D. .75 diopters

9. Your patient can see 20/20 with each of the following.  Which would you record as the final refractive results?

A. -1.50 + 1.50 x 180

B. -1.75 + 1.50 x 180

C. -1.25 + 1.50 x 180

D. -2.00 + 1.50 x 180

10. You are checking the cylinder axis with the cross-cylinder on a plus cylinder phoropter.  The axis is aligned at 90 degrees.  Upon flipping the cross-cylinder, the patient reports better vision when the white dot is to the right of the "A", or the axis mark.  What is the next step?

A. Rotate the cross-cylinder counter-clockwise

B. Rotate the cross-cylinder clockwise

C. Dial in more cylinder power

D. Dial in less cylinder power

11. Your patient needs 4 D of cylinder power according to the auto-refractor reading.  When using the cross-cylinder, your initial adjustment of the axis dial will be about:

A. 20 degrees

B. 15 degrees

C. 10 degrees

D. 5 degrees

12. When using the cross-cylinder to check the cylinder power:

A. The "P"s are aligned with the axis

B. The "A"s are aligned with the axis

C. The wheels are aligned with the axis

D. It does not matter what is aligned with the axis

13. You are using the cross-cylinder on a minus cylinder phoropter to check the cylinder power.  Your patient sees best when the white dots are lined up with the "P"s.  What is the next step?

A. Rotate the cross-cylinder counter-clockwise

B. Rotate the cross-cylinder clockwise

C. Dial in more cylinder power

D. Dial in less cylinder power

14. Your patient can see 20/20 with each of the follow corrections.  Which would you record as the final refraction?

A. +1.25-1.50x180

B. +1.00-1.00x180

C. +1.50-2.00x180

D. +1.25-1.75x180

15. It is usually not a good idea to recheck the sphere power before you are finished with checking the cylinder power.

A. True

B. False