I wear lineless trifocals. i have gotten used to them, but i scratch them so much. They have to be replaced every 6-months. I mow the pasture with a brush hog, and it gets dusty. I hate it when the sweat get's on my lense. I take fish oil for my squeaky joints, as well as flax oil vitamin supplements. The lense get smudged, and i have to wash them off with water, and liquid soap. Do you think I would fair any better with contact lense? i never have tried them. My wife went to contact lense a couple of years ago, and loves them.