Contribution of Posterior Corneal Astigmatism to Total Corneal Astigmatism in a Sample of Egyptian Population

被引：13

作者：

Hosny, Mohamed ^{[1
]}

Badawy, Alaa ^{[1
]}

Khazbak, Lobna ^{[1
]}

Anis, Mohamed ^{[1
]}

Azzam, Sarah ^{[1
]}

机构：

[1] Cairo Univ, Ophthalmol, 84 Shehab St, Giza 12411, Egypt

来源：

CLINICAL OPHTHALMOLOGY | 2020年 / 14卷

关键词：

posterior corneal astigmatism; total corneal astigmatism; Scheimpflug imaging; vector analysis; ANTERIOR; SURFACE;

D O I：

10.2147/OPTH.S265647

中图分类号：

R77 [眼科学];

学科分类号：

100212 ;

摘要：

Purpose: To determine the percentage of contribution of the magnitude of posterior corneal astigmatism to total corneal astigmatism using Scheimpflug imaging. Methods: This prospective cross-sectional study was conducted on 356 eyes of 356 patients, where the total corneal astigmatism was calculated by addition of anterior and posterior corneal astigmatism using vector analysis and then the percentage of posterior to total corneal astigmatism was calculated. Results: The percentage of contribution of posterior to total corneal astigmatism was about 30% in patients with With The Rule astigmatism and about 8% in patients with Against The Rule astigmatism. Conclusion: Posterior corneal astigmatism should not be neglected during calculation of total corneal astigmatism as neglecting posterior corneal astigmatism can result in errors during calculation and correction of astigmatism.

引用

页码：3325 / 3330

页数：6

共 11 条

[1] The shape of the anterior and posterior surface of the aging human cornea [J].