Whatever sunglasses you select they should provide the most possible UV protection possible. It's good to find a pair of glasses that block the sun from all angles, best achieved with a large framed pair that wrap around the face. Gray tints are generally used as an all- purpose tints reducing the overall brightness with the least amount of color distortion. The gray lenses are a good lens for general use and driving. Brownish and amber tints are another example of good all-purpose glasses.
The reason the process is called half-silvered is because the reflective molecules applied over the glass is distributed evenly but only half the glass is covered because of the speckled process. Thus the surface will reflect only about half the light striking the surface, letting the other half go through the glasses. The lenses have millions of molecules of substances such as silver halide or silver chloride. When the lenses are exposed to UV rays from the sunlight, the molecules embedded in the lenses undergo a chemical reaction causing them to absorb light thus darkening.
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