It is often said among diabetic patients that lasers are bad and that the more lasers are used the more vision loss occurs. Even among some medical staff this opinion is shared. Indeed, patients often experience some degree of vision loss in the early stages after laser treatment. This is a normal process after laser treatment, because: First, the laser is a surgical treatment process, which will inevitably bring about surgical damage, a certain degree of visual function loss. However, this damage can be repaired after a certain period of time, and a certain degree of recovery can be achieved. Secondly, there is a possibility of aggravating the development of macular edema after total retinal photocoagulation. Thirdly, there are a few patients with progressive proliferative diabetic retinopathy, where it is difficult to control the progression of the disease with laser alone, and the further progression of their disease exacerbates the loss of vision. It is important to reiterate that fundus laser treatment only serves the purpose of controlling the disease and reducing the risk of vision loss, not improving vision! Foreign research data show that after 9 months to 3 years of laser treatment, 27% of patients with improved vision, 66% of patients with unchanged vision, and 7% of patients with deterioration; while only 10% of patients without laser treatment had improved vision, 27% of patients with unchanged vision, and 63% of patients with deterioration! The difference between treated and untreated patients is significant and even more striking. For patients who need laser treatment, if they adopt a wait-and-see and hesitant attitude, they often miss the best time for laser treatment, leading to further progression of the disease and even blindness! In this case, although vitreoretinal surgery can still be performed, fundus laser also remains a necessary option during or after surgery, and the treatment is very costly and will not exceed the effect of timely laser treatment.