POST TEST FOR MODULE 19:  Clinical Optics, Part 3

                                                Measurements, Adjustments, Calculations, and Formulae             Catalog      

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1. A monocular PD is measured from:

A. the corneal reflex of the right eye to the corneal reflex of the left eye

B. the center of the bridge of the nose to the corneal reflex 

C. the inner pupil edge of OD to the outer pupil edge of OS

D. the outer pupil edge of OD to the outer pupil edge of OS   

2. If the A-box measures 44, the DBL measures 22, and the PD measures 62, calculate the total lens decentration.

A. 6 mm

B. 8 mm

C. 4 mm

D. 2 mm    

3. What is the spherical equivalent of -4.00+2.00x180?

A. -2.00

B. +2.00

C. -3.00

D. +3.00              

4. Transpose +3.00-2.00x90.

A. +1.00+2.00x180

B. +1.00-2.00x180

C. +5.00-1.00x90

D. +5.00-1.00x180     

5. Which power would match up with 90 on a power cross of -3.00+1.00x180?

A. -2.00

B. +2.00

C. -3.00

D. +3.00     

6. The axis cross is typically used for:

A. retinoscopy with loose lenses

B. figuring lens power at 180

C. figuring lens power at 90

D. reading the glasses prescription         

7. What is the power at 90 for the the prescription +4.00+200x135?

A. +2.00

B. +4.00

C. +5.00

D. +6.00      

8. How would the power of a -10 D lens need to be adjusted if moved 5 mm closer to the eye?

A. to -9.50 D

B. to -10.50 D

C. to -15.00 D

D. to -5.00 D      

9. If a lens has a significant cylinder correction, how should a vertex adjustment be made?

A. ignore the cylinder power

B. take the spherical equivalent

C. figure the vertex adjustment for each primary meridian

D. subtract the cylinder power from the sphere power          

10. What is the focal length in mm of a 5 D lens?

A. 10 mm

B. 100 mm

C. 20 mm

D. 200 mm       

11. An object is 1 meter from a +6 diopter lens.  How far from the lens does the image focus?

A. 10 cm

B. 20 cm

C. 50 cm

D. 60 cm 

12. How far will a 3 D prism deviate light at a distance of 500 cm?

A. 150 m

B. 15 m

C. 1.5 m

D. 15 cm       

13. Convert the following K readings to a cylindrical correction, 46.00 x 90 and 44.00 x 180.

A. +1.00 x 180

B. +2.00 x 180

C. +2.00 x 90

D. -1.00 x 180     

14. If the diopter reading of the cornea is 45, what is the radius of curvature?

A. 6.50 mm

B. 8.50 mm

C. 7.50 mm

D. 8.50 cm      

15. If the base curve is +4 and the lens power is -3.00 D, what is the ocular curve of the glasses lens?

A. +1 D

B. +7 D

C. -1 D

D. -7 D