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Approximate tear volumes under flexible contact lenses
American Journal of Optometry and Physiological Optics
|December 1, 1979
Summary
Researchers quantified tear volume under flexible contact lenses using mathematical models. The study estimates approximately 10 microliters of tear fluid is trapped beneath the lens during wear.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Contact Lens Technology
Background:
- Understanding tear volume under contact lenses is crucial for evaluating lens performance and ocular health.
- Previous methods for measuring in situ tear volume have limitations.
Purpose of the Study:
- To quantify the tear volume trapped beneath flexible contact lenses in situ.
- To develop a mathematical approach for calculating tear volume based on lens geometry.
Main Methods:
- Mathematical treatment was applied to calculate the flexed back radii of flexible contact lenses.
- Tear volume under the lens was calculated for each hypothetical radius.
- Twelve different lens situations were analyzed.
Main Results:
- The study estimated the tear volume under flexible contact lenses to be on the order of 10 microliters.
- The mathematical model provides an estimation of trapped tear fluid volume.
Conclusions:
- The developed mathematical method offers an estimation of in situ tear volume under flexible contact lenses.
- The accuracy of the method is constrained by several inherent assumptions.
- Further refinement may be needed to improve the precision of tear volume quantification.