lens material gives a brief description about the materials being commonly used for making lenses
TRANSCRIPT
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DONE BY,S ARYA DAS
2nd YR, 3rd SEMBHARTIMAIYA COLLEGE OF OPTOMETRY
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INTRODUCTION
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CROWN GLASS
Crown glass resist scratching
It is not easily affected by the environmental factors.
It has a refractive index of 1.523.
This material is low in chromatic aberration.
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continue.........
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HI-INDEX PLASTICS
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• It is a very impact resistant lens material.
• Trivex is a triperformance lens material.
• It offers a triple ccombination of :-
(i) Superior optics
(ii) Impact resistance
(iii) Ultra light weight
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Continue..........
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NXT material
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• Lenses that are made of two or more layers of materials are known as laminated lenses.
• Lamination is done in polarizing lenses to cut out reflected glare.
• Lamination can also be done to increase impact resistance
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