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Contour mapping of spectacle lenses
1Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, Peoples Republic of China.
Summary
New optical methods precisely map spectacle lens deviations across the entire lens surface. These techniques offer a comprehensive, accurate assessment of optical power and aberrations for all lens types.
Area of Science:
- Optics
- Optical Engineering
- Ophthalmology
Background:
- Conventional focimeters measure only a small region of spectacle lenses.
- Existing methods provide limited data points, missing overall lens characteristics.
Purpose of the Study:
- To develop novel optical methods for comprehensive spectacle lens aberration mapping.
- To enable accurate, full-aperture measurement of spectacle lens parameters.
Main Methods:
- Utilizing optical Fourier filtering and optical correlation for contour-mapping lens deviations.
- Employing fringe pattern analysis and optical processing via defocusing.
- Developing a fringe-reading technique involving reticle rings.
Main Results:
- Fringe patterns vividly depict lens characteristics, allowing qualitative and quantitative analysis.
- Accurate determination of sphere power, cylinder power, cylinder axis, prism power, and prism orientation.
- Methods demonstrated suitability for sphere, spherocylinder, prism, multifocus, and progressive power lenses.
Conclusions:
- The proposed optical methods provide a practical, accurate approach for full-aperture spectacle lens measurement.
- These techniques surpass conventional methods by offering comprehensive data and high precision.
- The methods are versatile, applicable to a wide range of spectacle lens designs.