Fascinating story, and I love the implication that you were lifeguarding without glasses. I know from personal experience that bright sunlight improves visual acuity (bright images, pupil constriction, and squinting all help), so obviously you were able to do your job, but the mental image is pretty funny!
I actually never though of that and had a good laugh reading your comment.
I had to pass a medical with an eye test for the job so I presume I was safe.
Eyesight is a complicated thing, I have one eye much worse than the other, can read the monitor fine with my right eye and not at all with my left eye.
I can use a monitor OK for an hour or two with no glasses but after that I get a headache.
My right eye defiantly compensates for my left.
