Recovered from tia except for loss of peripheral vision in left eye and the left side of right. experiencing further sight loss. is this usual?

Not a TIA: If you still have vision loss beyond a few hours, you did not have a tia, you had a stroke. If it is getting worse, go directly to the emergency department now. Urgent treatment can stop the loss and maybe reverse it.

No: It is not normal. Often visual loss after stroke is permanent or get better over time. If your vision is degrading, you should see your eye doctor as soon as possible.