Rating | Solver | Clue |
---|---|---|
MONOCLE | Single lens | |
ASTIGMATISM | A defect of the eye or of a lens, in consequence of which the rays derived from one point are not brought to a single focal point, thus causing imperfect images or indistinctness of vision. | |
ABERRATION | ...irror, of rays of light emanating from one and the same point, or the deviation of such rays from a single focus; called spherical aberration... |