ROP (retinopathy of prematurity) is a major cause of blindness in premature infants due to abnormal blood vessel growth stimulated by chemical factors like VEGF. Neonatologists screen and ophthalmologists stage ROP in the NICU. If ROP reaches a bad, threshold stage, then treatment is recommended to prevent scarring and reduce the risk of blindness. Treatment can include cryotherapy and intraocular injection. This video highlights laser treatment for threshold ROP.