Chronic and toxic can have ball backsight neuritis, inspect dish of oedema, retinal hemal convulsion, haemorrhage, oozy, eye shot is short of caustic and centrality stricture.

• 慢性中毒可有球后视神经炎，视盘水肿，视网膜血管痉挛、出血、渗出，视野缺损和向心性狭窄。