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Effect of ametropia on peripheral refraction
American Journal of Optometry and Physiological Optics
|September 1, 1981
Summary
Peripheral astigmatism increases with distance from the eye's center in most individuals. This progressive change in astigmatism varies significantly based on refractive error, impacting visual perception.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Astigmatism is a common refractive error affecting visual acuity.
- Understanding peripheral optical aberrations is crucial for comprehensive eye care.
Purpose of the Study:
- To investigate the progression of astigmatism in the peripheral visual field.
- To determine if refractive error influences peripheral astigmatism patterns.
Main Methods:
- Peripheral refraction was measured in 62 eyes using a Topcon refractometer.
- Measurements were taken along the horizontal meridian from -60 to +60 degrees.
Main Results:
- Astigmatism increased progressively towards the periphery in 91% of eyes, though less than theoretically predicted.
- Significant differences in astigmatism type were observed between myopes, hyperopes, and near-emmetropes.
Conclusions:
- Peripheral astigmatism exhibits a consistent, albeit reduced, increase compared to theoretical models.
- Refractive error is a critical factor influencing the characteristics of peripheral astigmatism.