Abstract
Purpose
We investigated the relationship between central and peripheral corneal astigmatism in elderly patients.
Methods
Seventy-six eyes of 76 elderly subjects (mean age = 72.6 ± 3.0 years) were included in the study. Corneal shape was evaluated using the Pentacam HR (Oculus, Wetzlark, Germany), which is comprised of a rotating Scheimpflug camera and a short-wavelength slit light. The power distribution map was selected and corneal astigmatism was calculated using front K-Readings in zones centered on the pupil. Analyzed zones were 2.0–6.0 mm in diameter.
Results
Corneal astigmatism decreased as diameter increased, similar to what was observed in eyes with with-the-rule astigmatism and against-the-rule astigmatism (ANOVA, p < 0.01). This effect was more pronounced in eyes with a large central corneal astigmatism (Spearman’s rank-correlation coefficient test, r = 0.51, p < 0.01). There was no change as to axis of corneal astigmatism (ANOVA, p = 0.98).
Conclusion
These results suggest that the relationship between central and peripheral corneal astigmatism should be taken into consideration to optimize vision when astigmatic correction is needed.
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Acknowledgements
We wish to thank Dr. Hiroshi Uozato for teaching and encouragement and Editage (Cactus Communications Inc., Tokyo, Japan) for critical review of the manuscript. This study was supported by grants awarded to TK from Kitasato University School of Allied Health Sciences (Grant-in-Aid for Research Project, No. 2014–2017) and Kitasato University Research Grant for Young Researchers (2014–2017).
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Kawamorita, T., Shimizu, K., Hoshikawa, R. et al. Relationship between central and peripheral corneal astigmatism in elderly patients. Opt Rev 25, 336–339 (2018). https://doi.org/10.1007/s10043-018-0427-2
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DOI: https://doi.org/10.1007/s10043-018-0427-2