Congenital ptosis repair & risk at the age 25?

I am ahmed hossen(25)a university graduate from Bangladesh.I was born with left eye congenital ptosis.Few days ago,i consulted with a doctor in a local hospital.they said about levator muscle functions is 15/7mm.I have 6/6 vision.As I was raised in a humble family,my parents didn't give much attention to that. Do i need repeated operation if i go under surgeon's knife for the first time?Is there any risk of damaging eye vision or physical risk?