Myopia
Conditions
Keywords
small incision lenticule extraction, vector analysis
Brief summary
Evaluate the effect of the size of optical zones (OZ) on myopia and astigmatism correction in small incision lenticular extraction.
Detailed description
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.
Interventions
PROCEDUREsmall incision lenticular extraction
In patients with the same degree of myopia, different optical zones were designed for operation
Sponsors
Tianjin Eye Hospital
Study design
Observational model
COHORT
Time perspective
RETROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 45 Years
Healthy volunteers
No
Inclusion criteria
* no ocular conditions * normal topography * central corneal thickness, \>500µm * residual stromal thickness, \>280 µm * pupil diameter, 2.78-4.9 mm (average, 3.76±0.43 mm);
Exclusion criteria
* history of intraocular surgery * pupil diameter, \>4.9 mm or \<2.78mm * keratoconus or corneal ectasia
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| astigmatic changes | 2021.03 | Observe the effect on changes in astigmatism by target induced astigmatism (TIA) versus surgically induced astigmatism (SIA) |
| error value | 2021.04 | Target refraction (TR) and surgically induced refraction (SIR) under different optical zones |
Countries
China
Outcome results
None listed