Oli999,
I think the best option for your friend is to get a big screen TV with lowest resolution possible NOT a computer monitor.
Reasons:
1. LCD will have the best display quality when running at native resolution
2. Lower resolution will give you much bigger text, icon than high resolution on same sized monitor/tv, for example, a 32 inch monitor running at 1024X768 will give you bigger text, icon than a 32 inch monitor running at 1366 x 768.
Recommendations:
1. Screen size as big as possible(if it doesn't cost an arm and a leg), native resolution as low as possible
2. We have a co-work who suffers from the same condition as your friend, he has a second monitor used as a magnifier - it displays enlarged image of the part of the desktop around the mouse cursor
Hope that helps