No. of Printed Pages: 3
1B08-008 1
B.Sc. (Hons.) IN OPTOMETRY AND
OPHTHALMIC TECHNIQUES (BSCHOT)
Term-End Examination
December, 2016

002.73
80S-008 DISPENSING OPTICS
Time hours Maximum Marks: 70
Note:

Part A -Answer any four questions. Each question carries 10 marks.


Part B -Write short notes on any sU. Each carries 5 marks.

PART A

Answer any four questions. Each question carries 10 marks. 4x10=40

1. What are prisms? List and explain the methods of incorporating prisms in spectacles.

2. Describe in detail, the various glass lens and plastic lens materials.

3. What do you understand by bifocal lenses Enumerate the terminology of bifocals. Explain the features of different types of bifocals.

4. Enumerate the various methods of specifying power. Explain the different ways of measuring power and uses of Geneva lens measure.

5. Describe in detail, the various manufacturing defects in ophthalmic lenses.

6. Describe the principle and advantages of Aspheric lenses.

PARTB

Write short notes on any Six. Each carries 5 marks. 6 x 5=30

7. Errors in power of lens while generating power to lens

Special Purpose Frames

Antifog and Scratch Resistant Coatings

Sports Spectacles

Fresnel Prisms

Boxing System

Write down the spherical equivalent of the following prescriptions

-4.5 x 76°

3.0/ 1.5 x 45°

2.25/ -4.5 x 76°

-2.0 cyl x 45°

4.0 cyl x 140°

Transpose the following in alternate forms

-5.00/ 1.00 x 110°

4.00/ 2.00 x 90°

-5.00 cyl 100°

6.00/ -2.00 x 180°

2.00 cy140°