A Randomized Study of Intraocular Caliper-assisted Capsulotomy for Age-related Cataract Patients With Corneal Limbus Opacity

Inclusion Criteria: * Adults aged 55 to 80 years with age-related cataract with pterygium, Corneal geriatric ring, and corneal limbus opacity; * Pupil diameter ≥ 6.5mm after pupil dilation; * Lens nuclear opacity grading score (LOCS III) lower than 4.0. Exclusion Criteria: * Patients had previous intraocular surgery; * Patients with a diagnosed eye disease that may affect the functions of lens suspensory ligament such as previous ocular trauma, lens subluxation, pseudoexfoliation syndrome, retinal pigment degeneration; * Patients had other ocular diseases that impair visual function include optic neuropathy, uveitis, and tumor. * Refused to participate the study.