
Comparison and applications of spherocylindrical, toroidal, and ellipsoidal surfaces for the correction of astigmatism in spectacle lenses
Author(s) -
Huazhong Xiang,
Nianning Li,
Jiandong Gao,
Gang Zheng,
Jiabi Chen,
Cheng Wang,
Songlin Zhuang
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.380700
Subject(s) - optics , astigmatism , lens (geology) , ellipsoid , physics , toroid , plasma , quantum mechanics , astronomy
Toroidal, spherocylindrical, ellipsoidal, and combined surfaces were used to correct astigmatism in aspheric spectacle lenses, and the differences among the proposed techniques were compared. Four astigmatic spectacle lenses were designed with the same optical parameters. A freeform measuring machine was used to evaluate posterior surfaces of aspheric spectacle lenses, and spherical and cylindrical power maps were generated and compared. The measured data were analyzed via commercial software. The toroidal lens helped to extend the clear vision range around the lens, and the ellipsoidal and spherocylindrical surfaces resulted in a more accurate centering of the lens around the optical axis of the eye, avoided astigmatism, and provided better visual perception.