Myopia
Conditions
Interventions
Group 1:In the same patient, the pupil's central deviation was measured using a Pentacam preocular segment analyser, a Keratron Scout corneal topographer and a computerised optometrist, and the result
Group 2:The central deviation of the pupil measured with the Pentacam preocular segment analyser was used to guide the procedure and analyse the quality of postoperative vision
Group 3:The central deviation of the pupil measured by Keratron Scout corneal topography is used to guide the procedure and analyse the quality of postoperative vision
Group 4:The central deviation of the pupil measured by a computerised optometrist is used to guide the procedure and analyse the quality of postoperative vision
Sponsors
The Affiliated Hospital of Southwest Medical University
Eligibility
Sex/Gender
All
Age
17 Years to 45 Years
Inclusion criteria
Inclusion criteria: (1) Age 17-45 years; (2) Patients require refractive surgery to improve their refractive status and have reasonable expectations of the surgery; (3) No active ocular surface, ocular and ocular appendage changes, no history of trauma, no serious systemic diseases and psychological diseases; (4) Pre-operative best corrected visual acuity = 0.8, no significant increase in refractive error within two years (increase = 0.50D); (5) Spherical lenses (5) -1.00D to -10.00D for spherical lenses and -5.00D or less for cylindrical lenses; (6) Pre-operative soft corneal contact lenses, rigid corneal contact lenses and keratoplasty lenses should be stopped for at least 1 week, 1 month and 3 months respectively.
Exclusion criteria
Exclusion criteria: (1) the presence of cone corneas, glaucoma, cataracts affecting vision, retinitis pigmentosa, retinal detachment, severe dry eye, active inflammation of the eye or severe ocular appendage pathology (defective or deformed eyelids); (2) amblyopia;(3) central corneal thickness (CCT) <460µm and residual corneal thickness (RCT) less than 50% of the preoperative corneal thickness; (4) diabetes mellitus, immune and collagen diseases, scarring and other conditions that affect postoperative healing; (5) mental illnesses such as anxiety or depression.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Off-centre pupil position;Postoperative visual quality; | — |
Secondary
| Measure | Time frame |
|---|---|
| Vision;Intraocular pressure;Diopter;Aberration; | — |
Countries
China
Contacts
Public ContactHongbin Lv
The Affiliated Hospital of Southwest Medical University
Outcome results
None listed