Myopic astigmatism
Conditions
Interventions
Manual limbal marking rotational alignment group:Manual limbal marking rotational alignment
OcuLign-assisted cyclotorsion control group:OcuLign-assisted cyclotorsion control
Sponsors
Zhongshan Ophthalmic Center,Sun Yat-sen University
Eligibility
Sex/Gender
All
Age
18 Years to 40 Years
Inclusion criteria
Inclusion criteria: 1.Patients aged 18 to 40 years with myopic astigmatism and stable refraction for at least 1 year. 2.Both eyes have normal corneal morphology and meet the indications for SMILE, including adequate corneal thickness. 3.Preoperative corrected distance visual acuity (CDVA) is 1.0 or better. 4.The absolute value of manifest refractive astigmatism is =0.75 D in both eyes, with an inter-eye difference in absolute cylinder =1.00 D. 5.Reliable preoperative seated-axis information for astigmatic alignment can be obtained in both eyes, and the investigator judges that the eyes meet the requirements for OcuLign cyclotorsion recognition and axis alignment on the VISUMAX 800 platform. 6.Patients voluntarily agree to undergo SMILE with the VISUMAX 800 platform, understand the randomization scheme, and provide written informed consent.
Exclusion criteria
Exclusion criteria: 1.History of ocular surgery, significant ocular trauma, or ocular diseases that may affect the safety or outcome assessment of refractive surgery. 2.Irregular astigmatism or poor repeatability of astigmatism measurements in either eye, making reliable axis analysis impossible. 3.Presence of strabismus, nystagmus, significant binocular visual dysfunction, or conditions affecting fixation or cooperation during examinations. 4.Severe systemic diseases that may affect ocular healing or surgical safety. 5.Pregnant or lactating women. 6.Patients unable to complete postoperative follow-up visits or questionnaire assessments as required.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Residual astigmatism at 3 months postoperatively; | — |
Secondary
| Measure | Time frame |
|---|---|
| Astigmatic vector analysis parameters;Contrast Sensitivity;Visual Acuity;Predictability of astigmatic correction;Corneal Topography;Total Ocular Aberration;Refraction and Refractive Outcome;Quality of Vision (QoV) Questionnaire; | — |
Countries
China
Contacts
Public ContactGuofu Huang
Zhongshan Ophthalmic Center,Sun Yat-sen University
Outcome results
None listed