Characteristics of visual field in myopic patients using Easyfield perimeter and its application in preoperative...

To investigate the visual field (VF) characteristics of myopic patients and evaluate the application of Easyfield perimetry in preoperative glaucoma screening of corneal refractive surgery.

This is a cross-sectional study. The VF of 213 myopic patients (426 eyes) undergoing corneal refractive surgery were collected using Easyfield perimetry. All patients underwent ocular examinations, including intraocular pressure, manifest refraction, and fundus photography. 426 VF were classified into 4 major categories: normal, glaucoma-like defects, myopia-related defects and combined defects, and the associated factors were investigated.

Mean defect (MD) of VF increased significantly with more positive spherical equivalent (β = 0.31, P < 0.001) and decreased significantly with increased axial length (AL, β = - 0.17, P = 0.011). Among the 426 VF tests, normal VF, glaucoma-like defects and myopia-related defects accounted for 88.7, 5.0, and 6.3%, respectively, and there were no combined defects. Both the prevalence of glaucoma-like VF defects and myopia-related VF defects were positively associated with longer AL (OR, 1.95; 95% CI, 1.37-2.77; P < 0.001 and OR, 2.41; 95% CI, 1.44-4.05; P = 0.001). Eyes with visual field defects within this cohort were more likely to demonstrate morphological changes such as tessellated fundus, peripapillary atrophy and tilted optic discs compared to those with a normal VF groups.

The VF changes observed in myopic patients can resemble those seen in glaucoma, and it is imperative to provide regular follow-up for these individuals. For patients undergoing corneal refractive surgery, Easyfield perimeter may play an important role in the preoperative screening of glaucoma.