Double torsion testing of prescription lenses

McAuliffe P.J. and Truss R.W. (1995) Double torsion testing of prescription lenses. Journal of Materials Science: Materials in Medicine, 6 11: 630-634. doi:10.1007/BF00123442


Author McAuliffe P.J.
Truss R.W.
Title Double torsion testing of prescription lenses
Journal name Journal of Materials Science: Materials in Medicine   Check publisher's open access policy
ISSN 0957-4530
Publication date 1995-01-01
Sub-type Article (original research)
DOI 10.1007/BF00123442
Open Access Status Not yet assessed
Volume 6
Issue 11
Start page 630
End page 634
Total pages 5
Publisher Kluwer Academic Publishers
Subject 1502 Banking, Finance and Investment
1500 Chemical Engineering
1304 Biophysics
Abstract In previous work, a modified double torsion test was developed to measure the fracture toughness of polymeric ophthalmic lenses with parallel surfaces. The method used production lenses so that the toughness of the manufactured articles could be measured directly. This method has now been extended to measure the K1c of powered lenses in which the thickness of the sample varied with both X and Y coordinates instead of being constant. A computer model of the sample's breaking load was constructed and the predicted values from this were compared to experimental results and a good correlation was obtained. In addition, the computer-generated correction factors were validated using the more rigorous compliance curve technique.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
 
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