Is there any chance that a visualy impaired person (like inborn cataract) can be a gyne?

Poor vision: It would depend on level of visual impairment. If the vision was good enough to get through school and training, then it would be possible.

Galactosemia: Galactosemia is a genetic disorder that causes cataracts and is the only cause of cataracts that is completely curable if galactose is removed from the diet. This is easy in babies who are simply given a formula made with sucrose instead of lactose.