An analysis was made of retindetached operations on 171 eyes from 1980 to 1992 in our hos- pital,scleras of 85 of the eyes were filled with dehydrated umbilical cord;42 received sclera-ex- ternal compresion of silica gel,and 20 received scleral encircling for surgery.The other 23 re- ceived dehydrated umbilical cord,scleral inside and outside filling with self-skin and,sclera-ex- ternal compresion.Their comparison showed no significant difference(P>0.05).The failure in the operation was related to the pulli...