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Superposition of sphero-cylindrical lenses using contour graphs
1Southern California College of Optometry, Fullerton 92831, USA.
Journal of the American Optometric Association
|October 1, 1996
Summary
Combining sphero-cylindrical lenses is simplified using contour graphs. This graphical method offers an accurate and practical solution for clinical overrefraction and lens combination, especially without a computer.
Area of Science:
- Optometry
- Ophthalmology
- Optical Engineering
Background:
- Clinical practice sometimes requires superposing thin sphero-cylindrical lenses.
- This is useful for overrefraction, creating a final lens from existing spectacles or toric contact lenses.
Purpose of the Study:
- To present a graphical method for combining sphero-cylindrical lenses.
- To offer a practical alternative to complex calculations.
Main Methods:
- Developed contour graphs for graphical solutions.
- Applied computer calculations to generate these graphs.
Main Results:
- Contour graphs provide accurate superpositions of sphero-cylindrical lenses.
- This graphical method is significantly simpler than traditional calculational approaches.
Conclusions:
- The contour graph method is a practical approach for combining sphero-cylindrical lenses.
- It is particularly useful in clinical settings lacking pre-programmed computers.