Evaluating the Effect of Optical Zones on Correction for SMILE: Vector Analysis

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

140 participants

Study Classification

OBSERVATIONAL

Study Start Date

2020-08-01

Study Completion Date

2021-08-01

Brief Summary

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Evaluate the effect of the size of optical zones (OZ) on myopia and astigmatism correction in small incision lenticular extraction.

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Detailed Description

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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.

Conditions

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Myopia

Study Design

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Observational Model Type

COHORT

Study Time Perspective

RETROSPECTIVE

Study Groups

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group A

small optical zone

small incision lenticular extraction

Intervention Type PROCEDURE

In patients with the same degree of myopia, different optical zones were designed for operation

group B

large optical zone

small incision lenticular extraction

Intervention Type PROCEDURE

In patients with the same degree of myopia, different optical zones were designed for operation

Interventions

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small incision lenticular extraction

In patients with the same degree of myopia, different optical zones were designed for operation

Intervention Type PROCEDURE

Eligibility Criteria

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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);