Need your advice for a visually impaired person

[Jlouis]

I can suggest the HP 97.

Bright, crisp and big red display, many and large keys, the 5 key has tactile identification mark ( I don't know how to name it in english), many keys, not a cluttered and shifted keyboard, big enter and + keys (like an adding machine).

There's some in ebay now, it's not that cheap, but he can find one that the printer and card reader is inoperative and no manuals, that is cheaper and go for it.

This is the best that I can think for him at the moment.

Good luck