http://www.seas.harvard.edu/news-eve...-perfect-image
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"Applied physicists at Harvard have created an ultrathin, flat lens that focuses light without the distortions of conventional lenses.
And by "ultrathin," they mean it — 60 nanometers thin. The big advantage for this technology, aimed at telecommunications signals, is that "the flat lens eliminates optical aberrations such as the 'fish-eye' effect that results from conventional wide-angle lenses. Astigmatism and coma aberrations also do not occur with the flat lens, so the resulting image or signal is completely accurate and does not require any complex corrective techniques."