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Applied Forces Changed Myopia Lens Optical Performance but Not Retinal Image Quality Tested Using a Newly Designed
Xiaoning Li1,2,3, Lun Pan3, Weizhong Lan3
1Optometry Department, Changsha Aier Eye Hospital, Changsha, Hunan, People's Republic of China.
Clinical Optometry
|April 20, 2023
Summary
Applied forces from rim screws alter peripheral optics in myopia lenses but do not significantly affect central vision or image quality. This impacts lens performance without changing the wearer's prescription or visual clarity.
Area of Science:
- Ophthalmology
- Optical Engineering
- Materials Science
Background:
- Myopia lens optical performance can be influenced by forces during mounting.
- Understanding these forces is crucial for accurate vision correction.
Purpose of the Study:
- To investigate how rim screw forces affect the optical performance of mounted myopia lenses.
- To evaluate the impact on residual refractive error and retinal image quality.
Main Methods:
- Internal lens stress was measured using a digital strain viewer (colmascope) in 120 lenses.
- Residual refraction and retinal image quality were assessed using OPD Scan III in 60 myopic adults.
- Comparisons were made between loose and tight lens mounting and between eyes.
Main Results:
- Significant differences in internal lens stress were found across lens zones and between right/left lenses.
- No significant differences in central residual refractive error or retinal image quality were observed between loose and tight mounting.
- Peripheral optical performance was altered by rim screw forces.
Conclusions:
- Rim screw forces modify peripheral optical performance of myopia lenses.
- These forces have negligible effects on central residual refractive error and visual image quality.
