Transscleral Diode Laser Photocoagulation for Type 1 Prethreshold Retinopathy of Prematurity

Purpose: to report the outcomes of transscleral diode laser photocoagulation for treatment of type 1 prethreshold retinopathy of prematurity (rop). methods: in this prospective interventional case series, 139 eyes of 73 infants with type 1 prethreshold rop underwent transscleral diode laser photocoagulation of the avascular retina under topical anesthesia without making a conjunctival incision. supplemental transpupillary diode laser photocoagulation was used for zone 1 rop in one eye. all patients were followed for 6 months. main outcome measures were regression of rop, incidence of unfavorable outcomes and adverse effects. results: at the end of follow-up, neovascularization regressed completely in all eyes and no eye developed an unfavorable outcome. repeated laser therapy was performed employing the same technique in 3 eyes (2.3%). ocular adverse effects were minor including mild conjunctival injection and edema in all patients, small conjunctival lacerations in 12 eyes (8.7%), minor self-limited vitreous hemorrhage in 2 eyes (1.4%) and mild self-limited hyphema in one eye (0.7%). conclusion: transscleral diode laser photocoagulation is a safe and effective treatment option for type 1 prethreshold rop. this technique can be performed under topical anesthesia.