Optically \Op"tic*al*ly\, 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]