Better vision and increased retina sensitivity following surgery. People often see floaters after surgery and grey hair and wrinkles they could not see before the surgery. Read the section in wikipedia. com on entoptoic phenomena
That is when your retina is the most sensitive. Eye has 3 ambient light systems: bright light: photopic system twilight; mesopic system dark: scotopic system this is 1000 times more sensitive than photopic. As I said read the wikipedia entry on entopic phenomena.