Eyes/Non-crusty blindness

Hey im new to this forum a little about me I have two female guinea pigs Wilma and Fiona, ive had both just a little over a year. They are both very social and active pigs. The other day though very suddenly Wilma started acting very strange, not moving or eating and when i picked her up and set her in a different spot she rammed the cage walls. I took her to the vet because I was very concerned the vet didnt really know what was wrong but thought she could be blind. Two days later she has settled down but I do think everything points to blindness. Does anyone have any experience or tips for caring for a blind pig? Thanks.