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Distribution of the anterior, posterior, and total corneal astigmatism in healthy eyes

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Abstract

Purpose

To evaluate the magnitude and axis orientation of the anterior, posterior, and total corneal astigmatism in normal healthy eyes of an Iranian population.

Methods

In a prospective cross-sectional study, ophthalmic and anterior segment parameters of 153 healthy eyes of 153 subjects were evaluated by Galilei dual Scheimpflug analyzer. The magnitude and axis orientation [with-the-rule (WTR), against-the-rule (ATR), and oblique] of the anterior, posterior, and total corneal astigmatism measurements (ACA, PCA, and TCA) were compared according to the age, sex, and other ophthalmic parameters.

Results

The mean ± SD age of the study population was 30 ± 5.9 years. The mean magnitude was 1.09 ± 0.76 diopters (D) for ACA, 0.30 ± 0.13 D for PCA, and 1.08 ± 0.77 D for TCA. Males had a significantly higher magnitude of PCA than females (p = 0.041). Most eyes had a WTR anterior astigmatism and an ATR posterior astigmatism. The WTR astigmatism had a higher mean magnitude compared to the ATR and oblique astigmatism in all the astigmatism groups, with a significant difference in the ACA and TCA groups (p < 0.05). PCA magnitude exceeded 0.50 D in only 7.8% of the subjects. ACA, PCA, and TCA were significantly correlated with each other and also had a significant correlation with the anterior and posterior maximum corneal elevation measurements (p < 0.001).

Conclusion

The results of this study although are limited due to the small number of participants and confined to our demographics, provided information regarding a population that was not described before and may be helpful in obtaining optimum results in astigmatism correction in refractive surgery or designing new intraocular lenses.

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Funding

No funds, grants, or other support was received. This article has not been presented at a meeting or published or submitted for publication elsewhere. The authors take responsibility for all aspects of the reliability and freedom from bias of the data presented and their discussed interpretation.

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Authors and Affiliations

  1. Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran

    Sepehr Feizi, Mohammad Naderan, Vahid Ownagh & Fatemeh Sadeghpour

  2. Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Qazvin Square, Tehran, 1336616351, Iran

    Mohammad Naderan

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  1. Sepehr Feizi
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  2. Mohammad Naderan
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  3. Vahid Ownagh
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  4. Fatemeh Sadeghpour
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Correspondence to Mohammad Naderan.

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Feizi, S., Naderan, M., Ownagh, V. et al. Distribution of the anterior, posterior, and total corneal astigmatism in healthy eyes. Int Ophthalmol 38, 481–491 (2018). https://doi.org/10.1007/s10792-017-0483-9

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  • DOI: https://doi.org/10.1007/s10792-017-0483-9

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