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Opv 306: Dispensing Optics Ii Question Paper

Opv 306: Dispensing Optics Ii

Course:Bachelor Of Science In Optometry And Vision Sciences.

Institution: Masinde Muliro University Of Science And Technology question papers

Exam Year:2013

MASINDE MULIRO UNIVERSITY OF SCIENCE AND TECHNOLOGY(MMUST) UNIVERSITY EXAMINATIONS. 2012/2013 ACADEMIC YEAR. THIRD YEAR SECOND SEMESTER EXAMINATIONS. FOR THE DEGREE OF THE BSC.OPTOMETRY AND VISION SCIENCES. COURSE CODE: OPV 306 COURSE TITLE: DISPENSING OPTICS II DATE: Friday 26th April 2013 TIME: 9.00 am-11.30 am INSTRUCTIONS TO CAMDIDATES -ANSWER ANY FIVE QUESTIONS IN ALL(EACH QUESTION CARRIES 15 MARKS) 1a)Using well drawn and labelled diagrams compare and contrast between bifocal and trifocal lenses.State their advantages and disadvantages. b)Briefly discuss any three types of bifocal lenses stating their advantages and disadvantages. 2a)What is an image jump and how or when does it occur in a bifocal lens.What options are available to eliminate image jump? b)Write short notes on invisible bifocals, blended bifocals and fused round-top bifocals.What are the advantages and disadvantages of fused round segment bifocals as compared to CR-39 bifocals? 3a)Write a short note to differentiate any three types of trifocal lens.What are the indications, advantages and disadvantages of these trifocal lenses discussed? b)Using well labelled diagrams, compare and contrast between occupational bifocal, occupational trifocal and occupational quadrifocal lenses. 4a)Briefly discuss historical development and advancement of Progressive Addition Lenses(PALs) b)What are indications, benefits, advantages and disadvantages of PALs. 5a)Using suitable diagrams, discuss the principle of decentration and prism effect in spectacle lenses. b)Using prentice''s rule,determine the prismatic effect of a-5.00D lens at a point 4mm above the optical centre. c)What are the relevancies of prismatic effects to the optometrist? 6a)What are absorptive filters? b)Briefly discuss three groups of absorptive filters. c)Discuss the categorization of tinted lenses. 7a)Briefly discuss the various types of specialty sunglasses. b)What are the desirable characteristics of an ideal sunglasses. c)Compare and contrast the effects of coated plastic lenses, polycarbonate lenses and tinted solid glasses in their ability to attenuate ultra-violet and infra-red radiations.

Opv 306: Dispensing Optics Ii Question Paper

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