依据Shields等方法对Coats病进行分期[7]：1期：视网膜毛细

According to Shields and other methods, Coats disease is staged [7]: Stage 1: Retinal telangiectasia; Stage 2: subretinal exudation may be combined, exudation located outside the fovea is stage 2A, and exudation located below the fovea is stage 2B ; Stage 3: Exudative retinal detachment, localized retinal detachment is stage 3A, and complete retinal detachment is stage 3B; stage 4: complete retinal detachment with glaucoma; stage 5: terminal stage.

According to Shields and other methods of Coats disease phased out: Phase 1: retinal capillary dilation; 2 stages: can be combined under the retina oozing, oozing is located in the center recess for 2A, oozing is located in the center recess is 2B period;

According to shields and other methods, Coats disease was divided into three stages: Stage 1: telangiectasia; stage 2: subretinal exudation; stage 2A: extrafoveal exudation; stage 2B: exudative retinal detachment, There were three stages of localized retinal detachment, 3b of complete retinal detachment, 4 of complete retinal detachment with glaucoma, and 5 of end-stage retinal detachment.<br>