Fundus lasers are currently the most effective and fundamental method for interrupting the blindness caused by diabetic retinopathy. The results of the Early Treatment Diabetic Retinopathy Study (ETDRS) in the United States showed that timely and appropriate laser treatment can reduce the risk of vision loss by 50% in patients with diabetic retinopathy. Depending on the condition, the fundus laser modalities used for diabetic retinopathy can be classified as disseminated photocoagulation (also known as total retinal photocoagulation), localized photocoagulation, and lattice-like photocoagulation. Disseminated photocoagulation is used to treat proliferative diabetic retinopathy by photocoagulating the peripheral fundus, while local and lattice photocoagulation can be used to treat diabetic macular edema.