Left eye squint with no vision. curable?

My friend has squint in her left eye with no vision.. is it possible to get it back to normal now .. she has got it operated on ce but it's again the same... it kind of pains at times and it's impossible yo continuously keep watching at one place.. so I need to understand if we again get it operated it will be the same or it can permanently be healed. Even after getting it operated its the same so we are  not sure if it can be cured properly n because it's eye so we dun want to take chances and want to understand what's the risk involved if we get it operated again.. I hope the 2nd surgery will not affect the right eye... n who are the best doctors.. which is the best hospital and what's the complete procedure if we need to get it operated again. If possible I would also like to know the estimate of the cost involved in the complete procedure. Do we have doctors in India to treat it.. and somebody in Bangalore Delhi or Hyderabad preferably.. Please share these details...