Even experts confuse it with detachment

“Degenerative Retinoschisis is very common with a prevalence of up to 7 percent in normal persons. Its etiology is unknown. It can easily be confused with retinal detachment by the non-expert observer and in difficult cases even the expert may have difficulty differentiating the two. Such differentiation is important since retinal detachment almost always requires treatment while retinoschisis never itself requires treatment and leads to retinal detachment”

Source: Wikipedia