Hmmm. I wonder whether it's the lens getting opaque, or the cornea?? Could they have glaucoma?? Most typically in a baby this age it's corneal scarring. I'll be most interested to see what the specialist has to say.

As you've heard, blind kitties do just fine, and if they have even a smidgen of vision they can usually make the most of it. Spunk, my blind punk, prefers to climb up rather than jump, which is the main difference.

I agree with Catty1 about waiting on a companion; get one baby sorted out, then you can consider another if you wish.