Nd:YAG Laser Vitreolysis for Symptomatic Vitreous Floaters

The goal of this clinical trial is to compare in the efficacy and safety of Nd:YAG laser vitreolysis for symptomatic vitreous floaters. The main question it aims to answer are: • examine the efficacy and safety in treating early onset of vitreous floaters （Weiss ring） using Nd:YAG laser vitreolysis. Participants with symptomatic floaters for one month will be randomly divided into two groups：early treatment group and delayed treatment group. Participants in the early treatment group will receive a YAG laser vitreolysis immediately and a sham laser treatment three months later, while participants in the delayed treatment group will receive a sham laser treatment immediately and a YAG laser vitreolysis three months late. Researchers will compare the two groups to see the efficacy and safety of early YAG laser vitreolysis for symptomatic vitreous floaters.