optical

a. கண்ணுக்குரிய, பார்வைக்குரிய, கண்பார்வைக்கும் ஔதக்கும் உரிய இடைத்தொடர்பு சார்ந்த, ஔதயியல் சார்ந்த, பார்வைக்குத் துணைசெய்யும் வகையில் அமைக்கப்பட்ட, ஔதநுல் கோட்பாடுகளின்படி அமைக்கப்பட்ட.

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Op"tic, Op"tic*al, a. Etym: [F. optique, Gr. oculus eye. See Ocular, Eye, and cf. Canopy, Ophthalmia.] 1. Of or pertaining to vision or sight. The moon, whose orb Through optic glass the Tuscan artist views. Milton. 2. Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina. See Illust. of Brain, and Eye. 3. Relating to the science of optics; as, optical works. Optic angle (Opt.), the angle included between the optic axes of the two eyes when directed to the same point; -- sometimes called binocular parallax. -- Optic axis. (Opt.) (a) A line drawn through the center of the eye perpendicular to its anterior and posterior surfaces. In a normal eye it is in the direction of the optic axis that objects are most distinctly seen. (b) The line in a doubly refracting crystal, in the direction of which no double refraction occurs. A uniaxial crystal has one such line, a biaxial crystal has two. -- Optical circle (Opt.), a graduated circle used for the measurement of angles in optical experiments. -- Optical square, a surveyor's instrument with reflectors for laying off right angles.

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