The influence of corneal astigmatism on retinal nerve fiber layer thickness and optic nerve head parameter measurements by optical coherence tomography

Abstract

Astigmatism is a worldwide common ocular disorder. Total astigmatism is mainly driven by corneal astigmatism(CA), which occurs due to an irregular shape of the cornea. In eyes with astigmatism, retinal images can be distorted, and the image size could vary according to the axis of astigmatism assessed with computer-based methodology in astigmatic eyes. Optical coherence tomography (OCT) can provide imaging of ocular structures by a noninvasive method, It is widely used in clinical and scientific ophthalmology to obtain high-resolution cross-sections of the retina images. The thickness of the retinal nerve fiber layer (RNFL) and optic nerve head (ONH) parameters can bemeasured by OCT.