EYE RELATED QUERY. Squint due to cp?

I had had squint surgery in my right eye successfully when I was 8 years old but now I am 25 years old and squint reappeared in my right eye . Doctor suggested me to do pen push-up exercises for 2 months because they don't want to hurry for surgery. Presently I am seeing 6/9 with the affected eye and 6/6 with the other eye. I am also suffering from mild Cerebral Palsy and my left leg tendon is tight so its ankle bends to 45° only. Doctor said that squint surgery won't work because of CP and spasticity in my body, squint will appear again after surgery. The reason of my squint is CP. My squint is intermittent exotropia of 15°. Here are my ques 1. Will the vision in my affected eye be 6/9 throughout my life or will it deteriorate further ? 2. How can a person have squint due to CP? 3. What is the solution except surgery as surgery is ineffective. 4. Will eye exercises help to correct it because the angle is only 15°.?