ObjectiveTo observe clinical outcomes of laser photocoagulation on retinopathy of prematurity (ROP). MethodsClinical data of 64 cases of ROP infants (127 eyes) were studied retrospectively. Fifteen infants (30 eyes) were diagnosed of pre-threshold ROP (type Ⅰ, 23.6%) and 49 cases (97 eyes) of threshold ROP (76.4%). All the eyes underwent photocoagulation through binocular indirect ophthalmoscope (532 nm or 810 nm) within 72 hours after the confirmation ROP. In all the 15 cases (30 eyes) of pre-threshold ROP (type Ⅰ), 6 of them (12 eyes) were photocoagulated by laser of 532 nm, and the other 9 ones (18 eyes) were treated with 810 nm. In 49 threshold ROP infants (97 eyes), 37 cases (73 eyes) and 12 ones (24 eyes) were treated with laser of 532 nm or 810 nm respectively. All the infants were followed up 12-36 months (18.4 months) since photocoagulation to investigate regression of ROP. All the data of ROP infants photocoagulated, such as recovery rate of one-time photocoagulation, repeat rate, unfavorable outcomes, and complications, were analyzed statistically according to the severity of ROP and wave length of laser employed. ResultsIn all the 127 photocoagulation treated eyes, ROP regressed completely in 125 eyes (98.4%), temporal retinal traction remained in 2 eyes (1.6%), and no retinal detachment was found. ROP regressed completely in 118 eyes (92.9%) after one-time photocoagulation, recovered totally in 6 eyes (4.7%) after repeating photocoagulation 2-3 times, and resorted to cryotherapy in 3 eyes (2.4%). Subconjunctiva hemorrhage, found in 12 eyes (9.4%), was the most common complication. During photocoagulation, anesthetic accident occurred in 1 infant (1.6%), and 1 eye developed cataract (0.8%). It was suggested from statistical analysis that there was no significant difference on efficiency or safety between pre-threshold (type Ⅰ) and threshold ROP photocoagulated by laser of 532 nm or 810 nm. However, almost all of the ROP infants need repeat photocoagulation or additional cryotherapy, and patients with unfavorable outcomes or severe complications, occurred in threshold ROP treated with 532 nm laser. ConclusionPhotocoagulation with 532 nm or 810 nm laser is effective for type Ⅰ pre-threshold or threshold ROP.