Materials Science and Engineering: An Introduction

Published by Wiley
ISBN 10: 1118324579
ISBN 13: 978-1-11832-457-8

Chapter 15 - Characteristics, Applications, and Processing of Polymers - Questions and Problems - Design Questions - Page 633: 15.D1a

Answer

The several advantages of using transparent polymeric materials for eyeglass lenses are as follows: 1. They have relatively low densities 2. They are light in weight 3. They are relatively easy to grind to have the desired contours 4. They are less likely to shatter than any other glass lenses 5. Wraparound lenses for protection during sports activities are possible 6.They filter out more ultraviolet radiation than do glass lenses. However, the principal disadvantage of these types of lenses is that some are relatively soft and are easily scratched. Plastic lenses are not as mechanically stable as glass and therefore, they are not as precise optically.

Work Step by Step

The several advantages of using transparent polymeric materials for eyeglass lenses are as follows: 1. They have relatively low densities 2. They are light in weight 3. They are relatively easy to grind to have the desired contours 4. They are less likely to shatter than any other glass lenses 5. Wraparound lenses for protection during sports activities are possible 6.They filter out more ultraviolet radiation than do glass lenses. However, the principal disadvantage of these types of lenses is that some are relatively soft and are easily scratched. Plastic lenses are not as mechanically stable as glass and therefore, they are not as precise optically.
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