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The effect of fit and parameter changes on soft lens rotation
American Journal of Optometry and Physiological Optics
|December 1, 1979
Summary
Steepening the base curve of soft contact lenses can reduce blink-initiated rotation. However, this adjustment must be cautious, as steep lenses may rotate off-axis.
Area of Science:
- Ophthalmology
- Optometry
- Biomedical Engineering
Background:
- Soft contact lenses with prism ballast or truncation are designed to minimize rotation.
- Understanding factors influencing lens rotation is crucial for effective vision correction.
Purpose of the Study:
- To evaluate how changes in base curve, diameter, and prism affect blink-initiated rotation in prism-ballasted and truncated soft contact lenses.
Main Methods:
- Investigated the impact of varying base curve, overall diameter, and prism incorporation on lens rotation.
- Assessed blink-initiated rotation in prism-ballasted and truncated soft contact lens designs.
Main Results:
- Increasing prism power did not significantly alter lens rotation.
- Increasing base curve (with adjusted diameter) was ineffective in reducing rotation.
- Steepening the base curve was the only modification found to reduce rotation.
Conclusions:
- Base curve steepness is a key factor in controlling soft contact lens rotation.
- Caution is advised when steepening the base curve due to potential off-axis rotation.