keratoconus
Conditions
Interventions
Group 1:The lens was removed without excimer cutting. The thickness of the lens was measured by OCT, the transmittal rate of the lens was measured by enzymoleter, and the lens was observed by optical
Group 2:The removed lens was cut 1:1 excimolecule according to the effective diopter. The thickness of the lens was measured by OCT, the transmittivity of the lens was measured by an enzyme spectromet
Group 3:The removed lens was cut 1:1.5 excimolecule according to the effective diopter. The thickness of the lens was measured by OCT, the transmittivity of the lens was measured by an enzyme spectrom
Group 4:The removed lens was cut 1:2 excimolecule according to the effective diopter. The thickness of the lens was measured by OCT, the transmittivity of the lens was measured by an enzyme spectromet
Sponsors
Jinan Mingshui Eye Hospital
Eligibility
Sex/Gender
All
Age
17 Years to 35 Years
Inclusion criteria
Inclusion criteria: 1.The patient had a desire to take the mirror and had a reasonable expectation of the surgical effect. 2.Age 17-35 years old; 3. The dioptric state was stable, and the annual increase of myopia dioptric number did not exceed 0.5D within two years. 4.Diopter: equivalent spherical lens degree -3.00D to -8.00D, column lens degree =1.00D; 5. Pupil diameter: open pupil =5cm, dark pupil =8cm; 6.Stop wearing soft contact lenses for at least 10 days, hard contact lenses for at least 1 month, and orthokeratology lenses for at least 3 months.
Exclusion criteria
Exclusion criteria: 1. The presence of keratoconus, glaucoma, cataract affecting vision, retinitis pigmentosa, retinal detachment, severely dry eyes, active eye inflammation or severe ocular adnexal diseases (eyelid defect or deformation); 2. Amblyopia; 3. Central corneal thickness (CCT)<460 µ M and residual corneal thickness (RCT) are less than 50% of preoperative corneal thickness; 4. Suffering from diabetes, immune and collagen diseases, scar constitution and other diseases that affect postoperative healing; 5. Suffering from mental illnesses such as anxiety or depression.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Corneal stromal lens thickness;Corneal stromal lens transmittance; | — |
Secondary
| Measure | Time frame |
|---|---|
| Corneal stromal lens water loss rate;Degree of corneal stromal lens expansion; | — |
Countries
China
Contacts
Public ContactYu lin,Lei
Jinan Mingshui Eye Hospital
Outcome results
None listed