Strength of Thin Chemtempered Lenses
- 1 January 1979
- journal article
- Published by Wolters Kluwer Health in Optometry and Vision Science
- Vol. 56 (1) , 39-47
- https://doi.org/10.1097/00006324-197901000-00007
Abstract
Static load tests were conducted on heat-tempered and chemtempered plano white crown glass lenses from five different optical laboratories. With both ball-on-ring and ring-on-ring loading, chemtempered lenses considerably thinner than 2.0 mm were found to be as failure resistant as 2.0-mm-thick heat-tempered lenses. A similar result was obtained previously using the drop-ball test. It is shown that the theory of brittle fracture can be used to relate the results of different tests and provides a rational basis for comparing the relative performance of chemtempered and heat-tempered lenses.Keywords
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