hi there hope you can read my comment and give an honest opinion ii dont have eye grades or astigmatism however my doctor found out i jave 4th cranial nerve palsy, at first sight my eyes look fine but once i look down my right eye will not go down as the left eye. I have a prism with just. 5 power. I am hesistant to wear it as i might get use to it and in the long run i will be needing more n more prism. Wearing it makes me more confidence as my coordination and balance improve a lot. Just that i was concern in the long run it will hurt me tha do good.