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Information Journal Paper

Title

Characteristics of Posterior Corneal Astigmatism in Different Stages of Keratoconus

Pages

  3-9

Abstract

 Purpose: To evaluate the magnitudes and axis orientation of anterior corneal Astigmatism (ACA) and posterior corneal Astigmatism (PCA), the ratio of ACA to PCA, and the correlation between ACA and PCA in the different stages of Keratoconus (KCN). Methods: This retrospective case series comprised 161 eyes of 161 patients with KCN (104 men, 57 women; mean age, 22. 35 ± 6. 10 years). The participants were divided into four subgroups according to the Amsler‑ Krumeich classification. A Scheimpflug imaging system was used to measure the magnitude and axis orientation of ACA and PCA. The posterior‑ anterior corneal Astigmatism ratio was also calculated. The results were compared among different subgroups. Results: The average amounts of anterior, posterior, and total corneal Astigmatism were 4. 08 ± 2. 21 diopters (D), 0. 86 ± 0. 46 D, and 3. 50 ± 1. 94 D, respectively. With‑ the‑ rule, against‑ the‑ rule, and oblique Astigmatisms of the posterior surface of the cornea were found in 61 eyes (37. 9%), 67 eyes (41. 6%), and 33 eyes (20. 5%), respectively; corresponding figures in the anterior corneal surface were 55 eyes (32. 4%), 56 eyes (34. 8%), and 50 eyes (31. 1%), respectively. A strong correlation (P ≤ 0. 001, r = 0. 839) was found between ACA and PCA in the different stages of KCN; the correlation was weaker in eyes with grade 3 (P ≤ 0. 001, r = 0. 711) and grade 4 (P ≤ 0. 001, r = 0. 717) KCN. The maximum posterior‑ anterior corneal Astigmatism ratio (PCA/ACA, 0. 246) was found in patients with stage 1 KCN. Conclusion: Corneal Astigmatism in anterior surface was more affected than posterior surface by increasing in the KCN severity, although PCA was more affected than ACA in an early stage of KCN.

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    APA: Copy

    Aslani, Fereshteh, Khorrami Nejad, Masoud, AGHAZADEH AMIRI, MOHAMMAD, HASHEMIAN, HESAM, Askarizadeh, Farshad, & KHOSRAVI, BAHRAM. (2018). Characteristics of Posterior Corneal Astigmatism in Different Stages of Keratoconus. JOURNAL OF OPHTHALMIC AND VISION RESEARCH, 13(1), 3-9. SID. https://sid.ir/paper/311827/en

    Vancouver: Copy

    Aslani Fereshteh, Khorrami Nejad Masoud, AGHAZADEH AMIRI MOHAMMAD, HASHEMIAN HESAM, Askarizadeh Farshad, KHOSRAVI BAHRAM. Characteristics of Posterior Corneal Astigmatism in Different Stages of Keratoconus. JOURNAL OF OPHTHALMIC AND VISION RESEARCH[Internet]. 2018;13(1):3-9. Available from: https://sid.ir/paper/311827/en

    IEEE: Copy

    Fereshteh Aslani, Masoud Khorrami Nejad, MOHAMMAD AGHAZADEH AMIRI, HESAM HASHEMIAN, Farshad Askarizadeh, and BAHRAM KHOSRAVI, “Characteristics of Posterior Corneal Astigmatism in Different Stages of Keratoconus,” JOURNAL OF OPHTHALMIC AND VISION RESEARCH, vol. 13, no. 1, pp. 3–9, 2018, [Online]. Available: https://sid.ir/paper/311827/en

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