Summer's here and with us spending so much time on the water the issue of water glare becomes a real challenge.
The first recommendation is a good quality pair of polarized sun glasses. Polarized glasses aid the fisherman in a number of ways; first and foremost by cutting glare and enabling you to see into the water seeing not only the fish but discerning underwater structure, lies and edges. A good pair of glasses also protects your eyes from those harmful UV rays, provides eye protection against errant false casts, and helps you see into the water much better allowing you to wade more safely. Do not go the cheap route on this aspect of your gear. Buy quality polarized glasses, take good care of them and they will give you years of glare free fishing enjoyment. Case in point, I passed along my first pair of Action Optics purchased in 1985 to my oldest son, and he's fishing with them to this very day. One note to consider, polarized glasses in the lighter hues, brown and even amber would be probably the better choice as they provide good vision even on those low light cloudy days, or those early morning or late evening outings.
Polarized glasses will reduce the glare; though in many cases not wipe it away completely. If you're observant, you'll find as your fishing a particular portion of a run or pool, even with your polarized glasses you still get some glare trouble. Simply shift your position. As you shift position, moving side to side you'll notice the glare will shift as well, and many times water that still maintained some glare to it will suddenly clear up enabling you to see into the water, seeing your fly, and moreover seeing the fish. Don't step into the water without the ability to see well.