What do you see at first sight to make it so called love at first sight ?

It isn’t what you see. It is what you feel. That feeling is two souls colliding and recognizing each other at a depth the human intelligence cannot comprehend. It is as binding as two people can ever get. Some develop that binding over time through effort, respect for each other and love. Some souls knew each other from another place and time that a human mind can rarely if ever remember but the souls know. It is a love that transcends time and space. Don’t discount it just because the human body isn’t recognizable for the souls recognize each other.