Ocular Hypotony and Refractive Predictability in RRD Surgery

Inclusion Criteria: * Diagnosis of primary rhegmatogenous retinal detachment (RRD) * Single-stage combined phacovitrectomy with clear corneal phacoemulsification with IOL implantation and 25G pars plana vitrectomy with silicone oil tamponade in the study eye * Preoperative intraocular pressure (IOP) in the study eye measured by Goldmann applanation tonometry: Hypotony group: IOP ≤ 7 mmHg; Normotony group: IOP \> 7 mmHg * Planned silicone oil removal approximately 3 months after the initial combined surgery and ability to attend follow-up for refractive assessment 1 month after silicone oil removal * Age (e.g., ≥18 years) and ability to provide informed consent Exclusion Criteria: * Previous intraocular surgery in the study eye * Secondary or complex RRD associated with ocular trauma, uveitis or other active intraocular inflammation, proliferative diabetic retinopathy or other advanced vascular retinopathies, significant ocular malformations or congenital anomalies of the globe or posterior segment, pre-existing advanced glaucoma or uncontrolled ocular hypertension, or other optic nerve pathology that could confound visual and refractive outcomes, corneal opacity, significant corneal irregularity, or media opacity precluding reliable biometry or accurate axial length measurement in the study eye, systemic diseases or autoimmune conditions with known ocular involvement that may affect the retina, choroid, or refraction