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optical

   Also found in: Dictionary/thesaurus, Medical, Acronyms, Wikipedia 0.01 sec.
optical
1. of, relating to, producing, or involving light
2. of or relating to the eye or to the sense of sight; optic
3. (esp of a lens) aiding vision or correcting a visual disorder
optical [′äp·tə·kəl]
(optics)
Pertaining to or utilizing visible or near-visible light; the extreme limits of the optical spectrum are about 100 nanometers (0.1 micrometer or 3 × 1015hertz) in the far ultraviolet and 30,000 nanometers (30 micrometers or 1013hertz) in the far infrared.
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This young soldier knew the optical illusions produced by tears.
Present At A Hanging And Other Ghost Stories by Bierce, Ambrose View in context
On the whole tour, particularly at the Descent, we undergo an optical illusion which often seems to be incredible.
A Tramp Abroad by Twain, Mark View in context
The entire ship's crew were undergoing a nervous excitement, of which I can give no idea: they could not eat, they could not sleep--twenty times a day, a misconception or an optical illusion of some sailor seated on the taffrail, would cause dreadful perspirations, and these emotions, twenty times repeated, kept us in a state of excitement so violent that a reaction was unavoidable.
20,000 Leagues Under The Sea by Verne, Jules View in context
 
 
 
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