Hello Aspirant, 

The candidates appearing for Railway Exams have to also clear RRB Medical Examination. This RRB Medical Fitness Test is conducted after Aptitude Test and Document Verification Stage once the candidate qualifies the theory exam. If the candidate fails in RRB Medical Test, he or she would not be further eligible for any of the posts in Railway.

Any type of Surgical treatment done for the eye will be considered as medical unfit in the RRB Medical Test.

Hope it helps..!!

Good Luck..!!