I used cheap sunglasses for years. Wear them all day and they gave me a headache, I think because of distortion. Also, they seem to only last a year or so and then it was time for another pair.
Being older, I needed bifocal magnification to tie mono knots and went looking for a solution. Costa Del Mar had just what I needed in various bifocal magnification to suit my vision and the polarization actually works, letting me see into the water a bit on a day with high glare. They cost a lot, but I've had the same pair for the past 13 years because they come with a nice case to protect them. I highly recommend Costa Del Mar sunglasses. Pay once, cry once as they say.
