I don't know what the exercises are but I knew a senior officer who was of an age where you would have thought he needed glasses but didn't have any and I once found him doing exercises for his eyes. My experience is that your eyes do their best to cope with focussing etc and I guess exercises might help; once you resign yourself to wearing glasses or contacts your eye muscles breathe a sigh of relief and go into 'relaxed' mode and let the lenses do the work. On that basis I guess that once you have used glasses or lenses the exercises will be a lot less effective. Good luck anyway!