Preview Test: The Many Facets of Prism

1. In which of the following will rays of light diverge?

A. Two triangular prisms conjoined at their bases

B. Four triangular prisms in a stack

C. Two triangular prisms in a stack

D. Two triangular prisms conjoined at their apexes

2. Which of the following represents a plus lens?

A. Two triangular prisms conjoined base to apex

B. Two triangular prisms conjoin base to base

C. Two triangular prisms conjoined apex to apex

D. Two triangular prisms stacked to form a single triangular prism

3. Which of the following represents a minus lens?

A. Two triangular prisms conjoined base to apex

B. Two triangular prism conjoin base to base

C. Two triangular prisms conjoined apex to apex

D. Two triangular prisms stacked to form a single triangular prism

4. Before light enters the myopic eye, what change in vergence helps focus light on the retina?

A. From parallel to diverging

B. From parallel to converging

C. From diverging to converging

D. From converging to converging

5. Before light enters the hyperopic eye, what change in vergence helps focus light on the retina?

A. From parallel to diverging

B. From parallel to converging

C. From converging to diverging

D. From parallel to parallel

6. How does changing the angle measurement of the apex influence the prismatic power of a triangular prism?

A. Increasing the apical angle measurement has no relation to the prismatic power

B. Increasing the apical angle measurement changes the base direction from base in to base out

C. Increasing the apical angle measurement decreases the prismatic power

D. Increasing the apical angle measurement increases the prismatic power

7. A circle is drawn on a spherical -5.00 D uncut lens blank. The optical center of the lens blank is the center of the circle. The radius of the circle is 3 mm. Which of the following statements is true?

A. The prismatic power at any point on the circle is 4.5^

B. The prismatic power at any point on the circle is 1.5^

C. The prismatic power on the circle varies

D. The prismatic power on any point on the circle is undefined

8. A patient's previous prescription was OD -2.00 D. The patient's new prescription is OD -2.00 1Δ BO. How many millimeters decentration and in what direction is required to induce 1D BOΔ?

A. 5 mm in

B. 5 mm out

C. 2 mm in

D. 2 mm out

9. A patient has OS 1Δ BO prescribed prism. How should the optician adjust the lens during verification?

A. So that the sphere and cylinder mires cross in the center of the reticle

B. So that the sphere and cylinder mires cross at the 1Δ hash mark above the center of the reticle

C. So that the sphere and cylinder mires cross at the 1Δ hash mark to the left of the center of the reticle

D. So that the sphere and cylinder mires cross at the 1Δ hash mark to the right of the center of the reticle

10. A patient has OD 4ΔBO prescribed prism and a monocular PD of 33 mm for the right eye. What should the distance from the prism reference point (center dot) on the lens to the center of the bridge be?

A. 37 mm

B. 33 mm

C. 29 mm

D. 35 mm

11. Which way does the eye turn when looking through 0.25Δ of base down prism?

A. Left

B. Right

C. Down

D. Up

12. Which way does the eye turn when looking through 0.4Δ of base in prism?

A. Temporally (out)

B. Nasally (in)

C. Up

D. Down

13. Which of the following prescriptions includes canceling prism?

A. OD 1.5Δ BI OS 1.5 Δ BO

B. OD 1Δ BU OS 1Δ BD

C. OD 1Δ BI OS 2Δ BI

D. OD 3Δ BO OS 4Δ BO

14. Which of the following prescriptions includes compounding prism?

A. OD 2Δ BI OS 2Δ BO

B. OD 1.5Δ BU OS 3Δ BD

C. OD 1Δ BO OS 2.4Δ BI

D. OD 4Δ @ 090 OS 4Δ @ 090

15. An optometrist prescribes the following: OD -3.25 DS OS -2.50 DS 4Δ BO. Which of the following correctly splits the prism?

A. OD -3.25 DS 1Δ BO OS -2.50 DS 2Δ BI

B. OD -3.25 DS 2Δ BU OS -2.50 DS 2Δ BO

C. OD -3.25 DS 3Δ BI OS -2.50 DS 2Δ BI

D. OD -3.25 DS 1.5Δ BO OS -2.50 DS 2.5Δ BO

16. What is the name of the prism notation on this Rx OS +4.00 DS 2Δ @ 045?

A. Rectangular coordinates

B. Polar coordinate

C. Vertical/Horizontal coordinates

D. Linear coordinates

17. You discover vertical imbalance in a pair of single-vision lenses without prescribed prism. The two sets of dots will always be:

A. On the lens with the lower refractive power on the vertical axis

B. On the lens with the higher refractive power on the vertical axis

C. On the lens with the lower refractive power on the horizontal axis

D. On the lens with the higher refractive power on the horizontal axis

18. For a single vision lens, what is the horizontal prism tolerance if the lens has a dioptric power 0.00≤ ±2.75 D?

A. 1 Δ

B. 0.33 Δ

C. 0.5 Δ

D. 0.67 Δ

19. A myope is prescribed base in prism in a single vision lens. Where must the MRP be in relation to the OC?

A. The MRP must be nasal to the OC

B. The MRP must be temporal to the OC

C. The MRP must be lower than half of the B measurement

D. The MRP must be higher than half of the B measurement

20. Which prism combination tends to induce dextroversion?

A. Base in for the right lens and base out for the left lens

B. Base up for the right lens and base up for the left lens

C. Base down for the right lens and base down for the left lens

D. Base in for the right lens and base in for the left lens

Evaluation Questions

21. In questions 21-23 please rate the effectiveness of how well each course met the stated learning objectives: Met the stated learning objectives?

A. Excellent

B. Very Good

C. Good

D. Fair

E. Poor

22. Avoided commercial bias/influence?

A. Excellent

B. Very Good

C. Good

D. Fair

E. Poor

23. How would you rate the overall quality of the material presented?

A. Excellent

B. Very Good

C. Good

D. Fair

E. Poor

24. How were you directed to this course?

A. 2020mag.com

B. OAA Website

C. NYSSO Website

D. Ohio Opticians Website

E. Other

25. Please describe the office in which you work.

A. Independent Optician

B. Independent Optometry

C. Chain retail

D. HMO/Military/Other

The Many Facets of Prism - Part 2