the results of alt depend on the severity of glaucoma : the eyes with advanced disc damage ( c/d greater than 0.9 , visual field less than 20 degrees ) had 59 % rate of filtering surgery , while the eyes with c/d 0.6-0.8 , visual field greater than 20 degrees at alt had a filtering surgery rate of 3 % .
C0017601
glaucoma
C0015392
eyes