Related Experiment Video
Updated: Jan 30, 2026

Ye's Swing Technique for Small-incision Lenticule Extraction Surgery
Published on: June 27, 2025
Correlation Between Myopia Degree and Postoperative Dry Eye Disease in Keratorefractive Lenticule Extraction Surgery
Chia-Yi Lee1, Shun-Fa Yang1, Yu-Ling Chang2
1Institute of Medicine, Chung Shan Medical University, Taichung, TWN.
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.
More Related Videos
Related Concept Videos
Peripheral Artery Disease V: Postoperative Nursing Management
One-Degree-of-Freedom System
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
Degrees of Freedom
For example, suppose there are three unknown numbers whose mean is 10; although we can freely assign values to the first and second numbers, the value of the last number can not be arbitrarily assigned.
Degrees of Freedom
For example, suppose there are three unknown numbers whose mean is 10; although we can freely assign values to the first and second numbers, the value of the last number can not be arbitrarily...
Correlations
Degree of Unsaturation
The degree of unsaturation for hydrocarbons is U = (2C + 2 − H) / 2, where C is the number of carbon atoms and H is the number of hydrogen atoms.

