If you start to see more floaters or eyesight max flashes, see your eyecare professional right away. These may be signs of some deterioration in your eyes. If these go unheeded, it can lead to blindness as you get older. If the conditions are caught early, your eyecare professional can prescribe treatment that can reverse the deterioration.
If you wear contact lenses, avoid wearing them while you sleep or for more than 19 hours. Unless you are wearing special lenses that are made for wearing overnight, your contact can deprive your eyes of oxygen and lead to extreme discomfort and possibly serious permanent damage to your sight.