NYSTAGMUS : you must find the best translation of this medical word in thai. The medical treatment is : port of the total optical correction (glasses), occlusion, etc. This is what your doctor is doing to your child. The effect of the total optical correction on visual acuity and nystagmus is extremely slow, in years (18 months to 2 years), sometimes even between 5-10 years. You have to be very patient and very persistent to that improvement appears. Alain