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Here's How to Get Cost-Effective Eye Exams, Glasses and Contacts All Without Vision Insurance
Can't afford vision insurance? No problem. You can get reasonably priced eye exams, glasses and contacts through discount ...
Science Daily3d
Thin lenses have a bright future
Paper-thin optical lenses simple enough to mass produce like microchips could enable a new generation of compact optical devices. Researchers have fabricated and tested flat lenses called Fresnel zone ...
Scientific American3d
NASA’s Hubble Space Telescope Was Never Meant to Look at the Sun. Astronomers Tried It Anyway
A little-known chapter of the Hubble Space Telescope’s history is a reminder of the risks of looking at the sun ...