A: outer retinal schisis (Patient 1, female, 65 years old, left eye). The solid arrow shows outer retinal schisis and the inner wall of the low echo cavum is not smooth; B: inner macular retinoschisis combined with shallow macular detachment (Patient 2, female, 57 years old, right eye). The dotted arrow shows inner macular retinoschisis, and there is a connective columnar microstructure in the low echo cavum. The solid arrow shows shallow macular detachment, and the low echo cavum is smooth.