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Morphometric Analyses of Retinal Sections
Published on: February 19, 2012
A novel method to quantify the edge contour of RGP contact lenses
K Ehrmann1, A Ho, K Schindhelm
1Cooperative Research Centre for Eye Research and Technology, The University of New South Wales, Sydney, Australia. kehr@cclru.unsw.edu.au
Summary
A novel optical profilometer precisely measures rigid gas permeable lens profiles and edges. This technology enables accurate, non-destructive analysis for contact lens research and quality control.
Area of Science:
- Ophthalmology
- Optometry
- Biomedical Engineering
Background:
- Accurate measurement of rigid gas permeable (RGP) lens profiles and edges is crucial for optimal lens performance and patient comfort.
- Existing methods may lack the precision or non-destructive capabilities required for comprehensive analysis.
Purpose of the Study:
- To describe a new method for accurate, non-destructive profile measurement of RGP lenses and their edges.
- To introduce a purpose-built optical profilometer for detailed lens analysis.
- To develop algorithms for quantifying common RGP lens edge features.
Main Methods:
- Utilized a purpose-built optical profilometer to non-destructively scan complete cross-sections of RGP lenses in multiple meridians.
- Verified the instrument's accuracy to be better than +/-2.5 micrometers.
- Developed mathematical algorithms to define and extract numerical values for seven common edge features from measured profiles.
Main Results:
- The optical profilometer provides accurate, non-destructive profile data of RGP lenses and edges.
- Instrument accuracy was confirmed to be superior to +/-2.5 micrometers.
- Algorithms successfully quantified key edge parameters, enabling detailed analysis.
Conclusions:
- The described optical profilometer offers a precise and non-destructive method for RGP lens profile and edge measurement.
- This technique facilitates advanced clinical contact lens research and enhances manufacturing quality control through objective edge quantification.
