An observational study in Myopia, sponsored by Tianjin Eye Hospital. Completed at 1 site in China. Open to participants aged 18 Years to 45 Years. Per ClinicalTrials.gov, last updated 2021-08-23.
Sponsored by Tianjin Eye Hospital · Observational
Evaluate the effect of the size of optical zones (OZ) on myopia and astigmatism correction in small incision lenticular extraction.
To retrospectively study whether different surgical optical zone sizes affect the correction of diopter and astigmatism in myopia patients. Divided into 2 groups according to the diameter of the optical zone. The vector analysis method was used to analyze the changes and errors of astigmatism in TR and SIR after operation. Generalized Estimation Equation (GEE) model is used for multiple regression analysis to evaluate the potential factors related to the error value.
984 studies on the registry are indexed under Myopia; 210 are open to participants now.
This study's enrollment of 140 is close to the median of 150 across 173 observational studies indexed under Myopia.
Browse Myopia studies →Tianjin Eye Hospital is the lead sponsor of 49 studies on the registry; 15 are open to participants now.
Counted across the registry records on this site, refreshed daily.
age of patients between 18-45 years; spherical refraction of -3.00 to -6.00 diopters (D) with or without astigmatism (\<-3.00 D); spherical equivalent, -3.00 to -6.00 D; corrected distant visual acuity (CDVA), >20/25
Exclusion Criteria:
small optical zone
Procedure: small incision lenticular extraction
large optical zone
Procedure: small incision lenticular extraction
In patients with the same degree of myopia, different optical zones were designed for operation
astigmatic changes
Observe the effect on changes in astigmatism by target induced astigmatism (TIA) versus surgically induced astigmatism (SIA)
Time frame: 2021.03
error value
Target refraction (TR) and surgically induced refraction (SIR) under different optical zones
Time frame: 2021.04
This study is completed, as verified in Aug 2021. You cannot join it, but the record below documents what was studied.
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Tianjin Eye Hospital