Check out Eschenbach's line of Contrast Enhancing Filters. SolarShields provide 40% more protection from the sun than regular sunglasses because of the top and side shield design.
These contrast filters are available in polarized gray, yellow, amber, orange and plum lens tints. The Gray Polarized and Plum lenses decrease overall light transmission and reduce glare, while the Yellow, Amber, and Orange lenses decrease blue light transmission and increase contrast.
The SolarShields are available for loan in three frame sizes. Small frames typically fit over your smaller eyewear or are great for indivduals who do not wear glasses, and the medium and large fitovers accommodate most standard eyewear.
The Yellow polycarbonate SolarShields provides moderate range blue light filtering, which is great for reading and watching television. These filters block 100% UVA/UVB light and 100% visable light up to 450nm.