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Zheludev, N. What diffraction limit?. Nature Mater 7, 420–422 (2008). https://doi.org/10.1038/nmat2163

Several approaches are capable of beating the classical 'diffraction limit'. In the optical domain, not only are superlenses a promising choice: concepts such as super-oscillations could provide feasible alternatives.

Eye shutterfor sleeping

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OED's earliest evidence for shutter eye is from before 1884, in a dictionary by Edward H. Knight, patent lawyer and expert in mechanics.

There is one meaning in OED's entry for the noun shutter eye. See ‘Meaning & use’ for definition, usage, and quotation evidence.

Eye shuttercamera

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Eye shutterapp

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Nikolay I. Zheludev is at the Optoelectronics Research Centre, University of Southampton, Highfield, Southampton SO17 1BJ, UK. n.i.zheludev@soton.ac.uk,

OED is undergoing a continuous programme of revision to modernize and improve definitions. This entry has not yet been fully revised.