Rowan seems to be following the trend my brother experienced after a fall off a ladder ~12 feet, very prolonged hospital stay, recovery over months
but by a year out he was back to 90-95% of pre-injury mental function and resumed work selling aircraft parts on the net. His hospital course
paralleled Rowans. My brother is a little more concrete in his thinking than before but in casual contact you would never know. Looks like Rowan's
outlook is positive long term. I wonder if the visual thing is more optic cortex than optic nerve, as cortex is more plastic than cranial nerves generally.

Re your comment about the weather, I had to giggle a bit, recalling your 100-200 mile rides in Canada at temps in the 11-17F range when you were
a randoneer enthusiast 25 or so yrs ago.