Premium
Ocular rotation factor and orientational demand with astigmatic lenses *
Author(s) -
Harris W. F.
Publication year - 1993
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1993.tb00477.x
Subject(s) - rotation (mathematics) , optics , physics , arc (geometry) , matrix (chemical analysis) , shape factor , optometry , mathematics , materials science , geometry , medicine , composite material
Ocular movements required in most visual functions are affected by lenses in front of the eye. Fundamental to an understanding of these movements are concepts such as the ocular rotation factor and the ocular orientational demand. In this paper the ocular rotation factor for thin spherical lenses is generalized for astigmatic lenses. A compact matrix equation is obtained for the orientational demand in the case of such lenses. The equations are satisfactory in ordinary situations but they break down under certain circumstances. Equations arc derived for these special circumstances in particular and also for all circumstances in general.