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Norms for hand-held rotary prism vergences
American Journal of Optometry and Physiological Optics
|February 1, 1985
Summary
This study establishes normal values for vergence ranges using handheld rotary prisms. These findings provide crucial benchmarks for comparing patient performance in optometric examinations.
Area of Science:
- Optometry
- Ophthalmology
- Vision Science
Background:
- Clinically useful norms allow for patient performance measurement against large populations.
- Establishing normal values for routine optometric functions is an ongoing trend.
Purpose of the Study:
- To establish mean values for vergence ranges (break and recovery) at 6 meters and 40 centimeters.
- To evaluate secondary effects on vergence measurements, including eye preference, prism order, and inter-clinician variability.
Main Methods:
- Utilized hand-held rotary prisms to measure vergence ranges (break and recovery) at distance (6m) and near (40cm).
- Assessed the statistical significance of eye preference, prism presentation order, and clinician differences on results.
Main Results:
- Established mean values for vergence break and recovery points at 6m and 40cm using handheld rotary prisms.
- Found no statistically significant differences based on eye preference, order of prism presentation, or clinician variability.
Conclusions:
- Provides normative data for handheld rotary prism vergence testing, complementing existing methods.
- Enables direct comparison of patient vergence measurements to established normal values, regardless of testing equipment.
- Supports the trend of establishing normative data for routine optometric assessments.