First of all be sure they are large enough. Light should not enter around the edges. Frames that curve back toward the temple are the best. Plastic lenses are less heavy than glass but they do scratch easier. Clean with a soft cloth, not a silicone tissue. To prevent glare you'll want to choose greenish grays, neutral grays and browns. Other colors absorb wavelengths and upset color balance.
When you put on the glasses on, the world should appear in true color, but not as bright. Sun sensor lenses are a good all-around choice. They adjust from dark to light. Polarized lenses block reflected glare, like from water.
Here's a frugal idea for you. Have an old pair of prescription lenses tinted to a desired density.
Here's another summer time tip for you. The scoop on an ice-cream scoop.


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