Overall, I see pretty well. I use glasses, but even without them I could manage to read or walk down the street if I had to.
However, the vision in my right eye is a little poorer than the left eye due to minor age-related problems with the vitreous humor (the jelly-like substance inside the eyeballs) and a cataract. I can see well, but the difference is noticeable.
Despite that, I see better and more clearly with both eyes than with just the left eye alone. The right eye still has something worthwhile to give — proof again that contributions of smaller size or lesser quality can be valuable. It all adds up.