B.Sc. DEGREE EXAMINATION, APRIL 2018
Fourth Semester
Optometry
OPTOMETRIC OPTICS
(2016 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. Snell's law.
2. Define light.
3. Describe the wave nature of light.
4. Define apical angle.
5. What is a best form spherical lens?
6. Sag formula.
7. Explain absorption.
8. Mention two plastic lens materials with their refractive
indices.
9. What is Glazing?
10. What is rotation test?
Sub. Code
42
CP-8574
2
wk12
Part B x 5 25)
Answer all questions.
11. List the properties of light.
Or
Give notes on electromagnetic spectrum.
12. Fresnel's prisms.
Or
Rotary prisms.
13. Properties of lens materials.
Or
High index lenses.
14. Explain what is meant by jump in trifocal lenses.
What are the two noticeable effects of jump to the
wearer?
Or
Define with diagrams
Segment height
Segment depth
Segment drop.
15. Toughened lens.
Or
Discuss the advantages of polarising filters.
CP-8574
3
wk12
Part C x 10 30)
Answer all questions.
16. Transpose cross-cyl to spherocyl lenses.
+2.00 DCX H +4.00 DCX V
-4.00 DCX V -6.50 DCX H
-0.50 DCX H +0.50 DCX V
+1.50 DCX V +2.25 DCX H
Or
Give detailed account on lenticular lenses.
17. Give an account on refraction through prisms.
Or
Discuss in detail about aberrations in ophthalmic
lenses.
18. Faults in the material of the lens.
Or
Explain in detail the process of surfacing.
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