Mathgeek: go with progressive bifocals, get them in polarized sunglasses in your prescription. Oakley makes some fantastic Rx-able sunglasses frames that will vastly improve your comfort on the water. The beauty of the progressives, once you adapt, it's more like your natural vision than lined bifocals. Reading glasses are a pain in the behind, on and off constantly through the day. Bifocal contact lenses can be great, but offer some slight compromise in acuity, same thing goes for monovision.
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