Prevention of ProliFerative Vitreoretinopathy With Intravitreal MethotreXate in Primary Retinal DEtachment Repair (FIXER) Trial

Inclusion Criteria: • Any adult patient, age \> 18 years-old, undergoing primary rhegmatogenous retinal detachment surgery with pars plana vitrectomy at the Cincinnati Eye Institute in Blue Ash, Ohio who is able to give informed consent. Exclusion Criteria: * Age \<18 years-old * Pregnant patients or patients of child bearing potential unwilling to utilize long term contraception for the 12-week period spanning vitrectomy surgery for retinal detachment repair up until the 3 month postoperative visit. * History of endophthalmitis, ruptured globe or significant trauma in the affected eye * Chronic retinal detachment (symptoms \> six weeks) * Any previous previous retinal detachment repair with pars plana vitrectomy, or scleral buckling surgery. Patients having undergone previous pneumatic retinopexy will not be excluded. * Presence of Grade C PVR: full thickness retinal folds or subretinal bands * Patients with contraindications to methotrexate, including breastfeeding, pregnancy, attempting to conceive a child or any known hypersensitivity or intolerance to methotrexate * Patients with diminished mental capacity precluding their ability to give informed consent.