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Parameter stability of soft contact lenses made from different materials
Ioannis Tranoudis1, Nathan Efron
1Department of Optometry and Neuroscience, University of Manchester Institute of Science and Technology, P.O. Box 88, Manchester M60 1QD, UK.
Summary
Soft contact lens parameters like water content and diameter change with wear and temperature. Dehydration reduces oxygen transmissibility and lens diameter, impacting performance.
Area of Science:
- Ophthalmology and Optometry
- Biomaterials Science
- Materials Engineering
Background:
- Soft contact lens (SCL) parameters can change during wear.
- Understanding these alterations is crucial for predicting lens performance and patient comfort.
- Various SCL materials with different water contents exist, potentially influencing stability.
Purpose of the Study:
- To investigate the parameter stability of eight different SCL materials.
- To assess the impact of temperature and wear on SCL properties.
- To correlate changes in SCL parameters with oxygen performance.
Main Methods:
- Clinical and laboratory experiments were conducted on eight SCL material types.
- Parameters measured included water content, diameter, and oxygen transmissibility.
- Measurements were taken at different temperatures (20°C and 35°C) and after 6 hours of wear.
Main Results:
- Elevated temperature (20°C to 35°C) significantly reduced water content and total diameter in most SCLs.
- A 6-hour wear period led to decreased water content, oxygen transmissibility, and diameter for most SCLs.
- High water content lenses showed less change in oxygen transmissibility after wear.
Conclusions:
- SCL dehydration due to wear and temperature affects oxygen transmissibility and diameter.
- Practitioners can use these findings to predict SCL parameter changes and oxygen performance.
- Material choice influences the degree of parameter alteration during lens wear.