Thank for the question. I am Dr.Desai, certified ophthalmologist and I look forward to answering this question for you.
First of all, I would like to clarify that getting laser treatment to get rid of glasses will not make you go blind.
It is an absolutely painless procedure which would take only a few minutes to be precise excluding the pre and post procedure time.
The first and foremost thing to be done is to get a fitness for surgery done.
Once you approach a refractive surgeon, his team will conduct a few tests to assess a few things in your eyes such as corneal thickness, dilated fundus exam for peripheral retina. If both of these meet the criteria for selection, then you will be given the option of undergoing LASIK surgery.
There are other methods also such as SMILE procedure and you may enquire about the same with your doctor.
Since a very thin flap of the cornea is taken during Lasik, there might be flap related issues later. Common complaints following procedure are dry eyes and glare or halos around lights. However these are not very serious and can be overcome over a period of time.
As for quality of surgery in Iran, I believe it is good. However I am not in a position to comment about the expertise of any particular surgeon or hospital .
I hope this answers your question to the point.
Do rate this response positively, if you find it satisfactory.
Best wishes and regards