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Basic principles of lens fracture testing
American Journal of Optometry and Physiological Optics
|November 1, 1978
Summary
This study analyzes ophthalmic lens breakage tests, evaluating how strain rates, stress areas, and energy impact results. Understanding these factors is crucial for accurate lens resistance assessment.
Area of Science:
- Ophthalmic optics
- Materials science
- Biomechanical engineering
Background:
- Ophthalmic lenses require rigorous testing for safety and durability.
- Evaluating lens resistance to breakage is critical for patient protection and product quality.
Purpose of the Study:
- To analyze various tests for ophthalmic lens breakage resistance.
- To investigate the influence of different testing parameters on evaluation outcomes.
Main Methods:
- Analysis of tests involving varied strain rates, stress areas, and energy losses.
- Examination of how lens-failure stress and thickness affect test results.
Main Results:
- Identified significant effects of strain rate, area under stress, and energy loss on test outcomes.
- Demonstrated the influence of lens-failure stress and thickness on the evaluation of breakage resistance.
Conclusions:
- Different testing methodologies yield varied results due to differing parameters.
- Standardized testing protocols considering these variables are essential for accurate ophthalmic lens evaluation.