-haptically-

adv. 1. By optics or sight. [ 1913 Webster ]

2. With reference to optics. [ 1913 Webster ]

Optically active,
Optically inactive (Chem. Physics), terms used of certain isomeric substances which, while identical with each other in other respects, differ in this, viz., that they do or do not produce right-handed or left-handed circular polarization of light. See optical activity. --
Optically positive,
Optically negative. See under Refraction. [ 1913 Webster ]