Myopic
Conditions
Interventions
Temporal corneal incision group:None
The upper corneal incision group:None
Sponsors
The Zhongshan Ophthalmic Center,Sun Yat-sen University
Eligibility
Sex/Gender
All
Age
18 Years to 45 Years
Inclusion criteria
Inclusion criteria: 1. The patient has a personal desire to improve refractive status through implantation of a posterior chamber phakic intraocular lens, and holds reasonable expectations regarding the surgical outcomes. 2. Aged between 18 and 45 years. Individuals outside this age range may be considered on a case-by-case basis if there are occupational requirements, high anisometropia, or corneal diseases requiring treatment. Prior to surgery, written informed consent must be obtained from the patient or their legally authorized representative, following thorough communication. 3. Patients with myopia or myopia combined with astigmatism. This modality is the preferred correction option for high myopia of –10.00 D or greater, and may be selectively considered for low to moderate myopia. Refractive status should generally be stable, defined as a annual change of = 2000 cells/mm^2, with stable cell morphology. 5. Anterior chamber depth generally required to be >= 2.80 mm (>= 2.60 mm for phakic posterior chamber intraocular lenses), with an open angle. 6. Absence of other significant vision-affecting ocular diseases and/or systemic organic disorders that may impede surgical recovery.
Exclusion criteria
Exclusion criteria: 1. Absolute contraindications: (1) Keratoconus or other corneal ectatic disorders in an unstable state; (2) corneal endothelial dystrophy; (3) severe dry eye disease; (4) active ocular pathology or infection; (5) severe adnexal disorders such as eyelid defect or deformity, or marked lagophthalmos; (6) glaucoma; (7) cataract; (8) fundus diseases significantly affecting visual acuity; (9) severe anxiety, depression, or other psychological or psychiatric disorders; (10) conditions that preclude cooperation with examination or surgery, such as epilepsy or hysteria; (11) severe hyperthyroidism or associated proptosis that has not yet stabilized. 2. Relative contraindications: (1) Unstable refraction (a change in spherical equivalent of >=1.00 D within the past 2 years); (2) Ciliary body cysts that may affect the positioning of toric intraocular lenses; (3) Treated and stable fundus pathologies, such as retinal detachment or maculopathy; (4) Significant abnormalities in preoperative visual function parameters affecting surgical outcomes, including but not limited to accommodation and convergence; (5) Pregnancy and lactation; (6) Systemic connective tissue or autoimmune diseases, such as systemic lupus erythematosus, rheumatoid arthritis, or multiple sclerosis. (Exceptions apply after evaluation by relevant specialists confirms no impact on the surgery or its outcomes.)
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Corneal Sensation; | — |
Secondary
| Measure | Time frame |
|---|---|
| Corneal Aberration;Non-Invasive Tear Film Break-up Time; | — |
Countries
China
Contacts
Public ContactJunshu Wu
The Zhongshan Ophthalmic Center,Sun Yat-sen University
Outcome results
None listed