optical Optical devices, processes, and effects involve or relate to vision, light, or images. adj usu ADJ n ...optical telescopes., ...the optical effects of volcanic dust in the stratosphere.
optical fibre ( optical fibres plural )
in AM, use optical fiber An optical fibre is a very thin thread of glass inside a protective coating. Optical fibres are used to carry information in the form of light. n-var
optical illusion ( optical illusions plural ) An optical illusion is something that tricks your eyes so that what you think you see is different from what is really there. n-count
Sloping walls on the bulk of the building create an optical illusion.
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"