I. -tə̇kəl, -tēk- adjective
Etymology: in sense 1, from optic (II) + -al; in other senses, from optic (I) + -al
1.
a. : relating to the science of optics
b. : dealing with or expert in optics
2. : relating to vision : ocular , visual
an optical illusion
3.
a. : designed or constructed to aid the vision
an optical magnifier
b. : acting by means of light or in accord with the principles of optics
II. adjective
1.
a. : visible 1a
optical wavelength
b. : of, relating to, or being objects that emit light in the visible range of frequencies
an optical galaxy
optical astronomy
2.
a.
(1) : of, relating to, or utilizing light especially instead of another form of energy
optical microscopy
(2) : using lasers
optical storage for a computer
b. : involving the use of light-sensitive devices to acquire information for a computer
optical character recognition
3. : of or relating to optical art