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Extending the range of the surgical keratometer
Annals of Ophthalmology
|July 1, 1986
Summary
This study enhances surgical keratometry precision by modifying the Terry keratometer with different objective lenses. These modifications extend the instrument's lower range for measuring animal corneas in ocular surgery.
Area of Science:
- Ophthalmology
- Surgical Technology
- Optical Engineering
Background:
- Increasing demand for optical precision in ocular surgery.
- Surgical keratometry is crucial for ocular surgery precision.
- Current surgical keratometers may not cover the range needed for animal corneas.
Purpose of the Study:
- To enhance the precision of surgical keratometry techniques.
- To extend the lower measurement range of the Terry keratometer.
- To facilitate accurate keratometry for animal corneas in research.
Main Methods:
- Modified the Terry keratometer by replacing the standard 175-mm objective lens.
- Utilized 200-mm and 250-mm focal-length objective lenses with a Zeiss operating microscope.
- Developed conversion equations and graphs for new lens measurements.
Main Results:
- Successfully extended the lower measurement range of the Terry keratometer.
- Provided conversion tools (equations and graphs) for accurate readings with modified lenses.
- Demonstrated feasibility of measuring animal corneas with the modified keratometer.
Conclusions:
- The modified Terry keratometer offers improved precision for ocular surgery.
- Extended range is suitable for measuring animal corneas, aiding research.
- This technique enhances the utility of surgical keratometry in specialized applications.