@mudnut My eyesight is pretty crap too, although since having cataracts done on both eyes I only wear glasses for reading/computer etc. In case you haven't found it on your camera, many cameras have an adjustment for the viewfinder to make it suit your eye. I always use the viewfinder. If I had to rely on the screen I'd need to put glasses on every time which would be a real pain.
If you are already using an adjusted viewfinder it may be worth looking at what auto focussing option you are using. Play around with the different options, taking the same photo with each to see if the results improve.
If your camera just has a screen & no viewfinder, or has a viewfinder which cannot be adjusted you might need to consider either glasses specifically for looking at the screen, or a different camera which has viewfinder adjustment.
In my experience a good viewfinder beats a screen any day. I'm not sure if it is only digital viewfinders which have adjustment. Mine is digital & whilst the level of detail is less than what the camera itself captures it is easy enough to see when it is in focus.