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Corneal shape change during accommodation
B K Pierścionek1, A Popiołek-Masajada, H Kasprzak
1Department of Biomedical Sciences, University of Bradford, West Yorkshire, UK. b.pierscionek@bradford.ac.uk
Eye (London, England)
|February 6, 2002
Summary
This study explored how the eye
Area of Science:
- Ophthalmology
- Optometry
- Corneal Physiology
Background:
- The cornea's refractive power is crucial for clear vision.
- Understanding factors influencing corneal shape is essential for ophthalmic research.
Purpose of the Study:
- To determine if the eye's focusing mechanism, accommodation, alters central corneal curvature.
- Investigating the relationship between accommodation and corneal topography.
Main Methods:
- Utilized a modified keratometer on 14 emmetropic subjects (ages 20-28).
- Measured corneal shape changes during induced focus shifts without vergence changes.
Main Results:
- Eleven subjects showed a mean change of approximately 0.4 D in central corneal curvature.
- Nine subjects exhibited increased curvature for near focus in at least one meridian.
- Five subjects displayed unexpected changes, with greater curvature at distance.
Conclusions:
- Accommodation appears to induce measurable changes in central corneal shape.
- Findings suggest a dynamic interaction between the eye's focusing system and corneal topography.