optical

-
op|ti|cal /'ɒptɪkəl/
[ADJ] usu ADJ n
Optical devices, processes, and effects involve or relate to vision, light, or images.
...optical telescopes.
...the optical effects of volcanic dust in the stratosphere.op|ti|cal fi|bre (optical fibres)
in AM, use optical fiber
[N-VAR]
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.op|ti|cal il|lu|sion (optical illusions)
[N-COUNT]
An optical illusion is something that tricks your eyes so that what you think you see is different from what is really there.
Sloping walls on the bulk of the building create an optical illusion.

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