CE Test Questions
Chromatic Aberration

Exam Questions
1. All of the following are part of the electromagnetic spectrum except

    A. Gamma radiation
    B. White light
    C. Ultraviolet radiation
    D. Radon
2. Colors with shorter wavelengths have ________ frequencies, longer wavelengths __________.

    A. Lower, higher
    B. Higher, lower
    C. Equivalent, shorter
    D. Higher, even higher
3. Light travels at ___________velocity.

    A. 200,000 km/sec
    B. 300,000 km/sec
    C. 100,000 miles/sec
    D. 1.500000 miles/sec
4. The ____________ the refractive index, the ___________ the velocity of light through the medium.

    A. Higher, slower
    B. Slower, higher
    C. Shorter, longer
    D. More uniform, faster
5. _____________ wavelengths with __________ frequencies move ____________ slower through a transparent medium.

    A. Shorter, lower, slower
    B. Longer, higher, slower
    C. Shorter, higher, slower
    D. Longer, lower, faster
6. The chroma that a patient might notice as color or blur in the lens periphery is caused by

    A. Axial chromatic aberration
    B. Axial radial motion
    C. Lateral chromatic aberration
    D. Lateral peripheral technology
7. A wavelength of about __________nm is used in the US to specify the refractive index of a specific material.

    A. 522
    B. 546
    C. 587
    D. 656
8. __________ Abbe values ___________ a lens' chromatic aberration.

    A. Higher, increases
    B. Higher, decreases
    C. Lower, increases
    D. Lower, does not affect
9. Generally, the higher the refractive index, the ___________ the Abbe value.

    A. Higher
    B. The same
    C. The lower
    D. Are not related
10. Place the following materials into ascending order of Abbe values.

    A. Hard resin, Trivex, 1.6 (MR8), 1.66, polycarbonate, crown glass
    B. Trivex, hard resin, 1.6 (MR8), 1.66, crown glass, polycarbonate
    C. Polycarbonate, crown glass, 1.6 (MR8), Trivex, 1.66, hard resin
    D. Polycarbonate, 1.66, 1.6 (MR8), Trivex, crown glass, hard resin
11. Axial chromatic aberration, in a plano lens, when viewing a red sign

    A. Causes the appearance of a brighter red
    B. Has no effect
    C. Creates about .2D of ACA
    D. Makes a rainbow of color at lens center
12. Color fringing around objects is the result of

    A. Lateral chromatic aberration
    B. Axial chromatic aberration
    C. More deviation of blue light than red
    D. A&C
13. The red/green duochrome test in a refraction is possible because

    A. The eye has about 1D of axial chromatic aberration
    B. The eye has about 1D of lateral chromatic aberration
    C. The eye has about 0.1D of axial chromatic aberration
    D. The eye has about 0.1D of lateral chromatic aberration
14. All of the following were issues with early polycarbonate lenses except, which were blamed on chromatic aberration

    A. Yellow and hazy lenses
    B. Poor processing techniques
    C. Asphericity
    D. Wrong base curves chosen
15. When comparing the Lateral chroma of a -4D polycarbonate and 1.66 high index lens, (15mm from center), the 1.66 lens

    A. Produces a much clearer lens
    B. Has an acuity that is about the same
    C. Improves visual acuity significantly
    D. A & C
16. Most wearers

    A. Have problems with low Abbe lens materials
    B. Adapt or are not bothered by the effects of Abbe
    C. Prefer higher Abbe materials in low powered lenses
    D. Have problems with high Abbe lens materials
17. All are ways to minimize the effects of chroma except

    A. Always use low Abbe lens materials
    B. Minimize lens decentration
    C. Use recommended base curves
    D. If chroma is suspect, consider higher Abbe materials
18. All of the following are the benefits of better peripheral lens designs (in low Abbe lenses) except

    A. Reduces off axis errors
    B. Reduces the additive effects of oblique errors and chroma
    C. Increases off axis errors
    D. Closer fitting lenses
19. All of the following are correct statements except

    A. Low Abbe by itself is not a reason to reject a lens material.
    B. A rejection of polycarbonate lenses may be due to other factors besides chroma.
    C. Color fringing due to chroma has no effect on vision.
    D. Well-centered lenses in a frame minimize chroma.
20. The main reason to not suggest SV lens fitting heights, especially in higher index lenses is

    A. A smaller diameter blank size will be required.
    B. Lens thinness at the top and bottom of the frame will be different
    C. A larger diameter blank size will be required.
    D. B & C

Evaluation Questions

21. In questions 21-25 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
26. Comments on this program: