Going blind from eyelash extensions can happen but is rare.
Going blind from eyelash extensions happens when your eyes come into contact with the glue "formaldehyde" which is what causes the blindness from eye extensions.
When you do get eyelash extensions your eyes are closed so the glue should not come into contact with your eyes.
So you can get eyelash extensions without becoming blind from it as long as you keep your eyes closed during the eyelash extension procedure and don't get any of the glue in your eyes.