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

ABSTRACT:

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

SUBMITTER: Hosny M 

PROVIDER: S-EPMC7569024 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature