Which is the best eye hospital in Japan?

Q:The matter is that at my mum a diabetics, she is 59 years old. We live in Uzbekistan.She has a Diabetic Retinopathy , one eye sees only – 1%, and another – 9%.Disease : Proliferative diabetic retinopathy.Please help us as quickly as possible, because this disease is very progressive. We will be very obliged to you.