# Correlation Between Myopia Degree and Postoperative Dry Eye Disease in Keratorefractive Lenticule Extraction Surgery

## TL;DR

This study found that people with high myopia who had a specific eye surgery were more likely to develop dry eye disease afterward.

## Contribution

The study identifies a correlation between high myopia and increased risk/severity of dry eye disease after keratorefractive lenticule extraction surgery.

## Key findings

- High myopia patients had higher rates of dry eye disease signs and symptoms post-surgery.
- Tear break-up time and Schirmer test results were worse in high myopia patients.
- Age and female sex were risk factors for dry eye disease in both myopia groups.

## Abstract

Purpose: This study aimed to investigate the relationship between myopia degree and the rate of postoperative dry eye disease (DED) in participants who received keratorefractive lenticule extraction (KLEx) surgery.

Methods: A retrospective cohort study was conducted, and participants who received KLEx surgery were included. After selection, a total of 95 and 76 eyes were classified into the low myopia (LM) and high myopia (HM) groups, respectively. The main outcomes are the postoperative tear break-up time (TBUT), Schirmer test, ocular surface staining, and DED-related symptoms. The independent t-test and generalized linear model were used for the statistical analysis of the present study.

Results: The postoperative uncorrected distance visual acuity (UDVA) and spherical equivalent (SE) were significantly better in the LM group (all p<0.001). Regarding the postoperative DED parameters, the TBUT and Schirmer test values were significantly higher in the LM group compared to those in the HM group during the whole follow-up period (all p<0.05). The rate of superficial keratitis and multiple DED symptom were significantly higher in the HM group than the LM group one month postoperatively (both p<0.05). Advanced age correlated with poor DED sign, and female sex correlated with poor DED symptom in the LM group (both p<0.05). On the other hand, both advanced age and female sex were associated with poor DED signs and symptoms in the HM group (all p<0.05).

Conclusion: HM may have a certain correlation with higher DED incidence and severity for participants who received KLEx surgery.