The term “aspheric” means non‐spherical but this simple definition could include toric
surfaces, which is not intended in this paper. Instead the term “aspheric” will cover only …

Rotationally symmetrical aspheric surfaces of spectacle lenses are constructed as either
“zonal aspherics” or “continuous aspherics.” Zonal aspherics consist of annular zones …

Ophthalmic lens design concerns the control of spectacle lens aberrations which occur
when the eye rotates away from the optical centre of the lens. The most significant …

Third order equations are developed giving sagittal and tangential power errors
corresponding to The eye rotating to look through the periphery of a spectacle lens. The …

One of the criteria in ophthalmic spectacle lens design is the elimination of oblique
astigmatism. For a range of equivalent powers, Seidel (primary or third-order) astigmatism …

The task of designing an ophthalmic corrective lens is one of optimizing a system by
modifying only a fixed front element with remainder of the system rotatable about the stop …

Especially regarding intraocular lenses and refractive corneal surgery, one finds numerous
concepts on how to improve the optical quality of the human eye through aspheric optics …

Merté (1950) described lens forms that correct oblique astigmatism at all ocular rotations.
The front surfaces of all lenses were flat, and the back surfaces were made aspherical as …

It is shown that, in general for a rotationally symmetric surface, the sagittal curvature is a
function of the first derivative and tangential curvature is a function of the first and second …

The significant aberrations in ophthalmic lenses are (oblique) astigmatism (spectacle
lenses) and spherical aberration (contact and intra-ocular lenses). In many cases, they …