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Document Type

Original Article

Abstract

Background: Axial length of 25.5mm or greater in high myopic eyes is commonly implicated in stretching and traction on the retina and choroid which lead to multiple complications: retinal tears and degeneration, posterior staphyloma, lacquer cracks and choroidal new vascularization.

Aim of work: to evaluate changes of the retinal vascular plexuses in high myopia in adults using optical coherence tomographic angiography.

Patients and Methods: This is a prospective, cross-sectional, descriptive study which was conducted on forty patients with high myopia. Patients had optical coherence tomography angiography done by Topcon® DRI-OCT. Measurements were corrected for magnification errors according to Littmann’s method and Bennet’s formula, based on measured axial length. The main outcomes of the study were the area of the foveal avascular zone (FAZ) of the superficial capillary plexus (SCP) and the deep capillary plexus (DCP).

Results: forty eyes in 23 patients, 14 males and 9 females, were included. Results showed that area of FAZ in SCP was wider than FAZ in the DCP. Area of the FAZ in the SCP and DCP layers had no correlation to the patients’ age, axial length, intraocular pressure, best corrected visual acuity. While the FAZ in SCP had a positive correlation to FAZ area in the DCP and a negative correlation to UCVA. The FAZ area measurements in the SCP layer were significantly higher in females than in males.

Conclusion: OCTA is a useful tool to study different pathologies in posterior segment and can take over invasive imaging techniques.

Keywords

The superficial capillary plexus layer, deep capillary plexus, Foveal avascular area, optical coherence tomography angiography.

Subject Area

Ophthalmology

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