My Pekingese.has Cloudy And Watery Eye(left Only) And Today I Found A White Spot Made Like A Shell Peanut, At The Bottom Part Of His Eye Lid,inside Of It.. While I Was Cleaning It And He Barked Like It Hurt Him? What Could This Be?

My pekingese dog, Oscar have a cloudy left eye. I took him to a vet this morning.  She said that something make a little hole in the eye and recommend that we take him to an eye hospital tonight, and said that it is a corneal ulcer.  Is it neccessary for the operation.

He could be going blind in one eye but still your vet