# Central corneal thickness, corneal endothelial cell density, and morphology in myopic eyes of young Chinese candidates for refractive surgery

## TL;DR

This study examines corneal thickness and endothelial cell characteristics in young Chinese individuals with myopia who are considering refractive surgery.

## Contribution

The study provides insights into the relationship between age, gender, and corneal parameters in myopic refractive surgery candidates.

## Key findings

- Age showed weak negative correlations with central corneal thickness and endothelial cell density.
- Males had slightly higher central corneal thickness and endothelial cell hexagonality compared to females.
- Spherical equivalent and axial length did not significantly affect corneal thickness or endothelial cell morphology.

## Abstract

To assess central corneal thickness (CCT), as well as the density and morphology of corneal endothelial cells (ECD) in myopic eyes.

A total of 400 patients scheduled for myopic refractive surgery were consecutively enrolled in this study. Preoperative evaluations encompassed endothelial cell density (ECD), average cell area (CA), coefficient of variation (CV), and percentage of hexagonality (HEX), all measured using the Nidek CEM-530. Additionally, central corneal thickness (CCT) was assessed using the Pentacam HR. Ocular biometric parameters, including axial length (AL), were recorded with the IOL Master 700. Each parameter was analyzed based on ocular laterality, age, gender, spherical equivalent (SE), and AL.

The analysis revealed that 39% of participants were female, with a mean age of 25.36 ± 6.92 years and a mean SE of -5.06 ± 1.92D. No statistically significant differences in ECD were observed between genders, although males showed slightly higher values for HEX and CCT. No significant differences in CCT, ECD, or corneal endothelial morphology were found among subgroups categorized by SE or AL. Significant negative correlations were observed between age and both ECD (r = -0.197, P < 0.001) and CCT (r = -0.111, P = 0.026), while positive correlations were noted with CA (r = 0.166, P = 0.001) and CV (r = 0.364, P < 0.001). After adjusting for age, ECD showed no significant association with SE or AL but demonstrated a weak positive correlation with CCT (r = 0.128, P = 0.011).

SE and AL show no significant effect on CCT or corneal ECD and morphology in our refractive surgery candidates. Weak age-CCT/ECD correlations were noted. Gender and ocular laterality effects warrant preoperative evaluation.