We present a comprehensive approach for the design of adjustable-focus lenses based on
the Alvarez principle. The design methodology consists of dividing the lens into two parts …

Alvarez and Lohmann lenses are variable focus optical devices based on lateral shifts of two
lenses with cubic-type surfaces. I analyzed the optical performance of these types of lenses …

We present two techniques to improve as-built miniature lenses that are defined with high-
order aspheric surfaces without losing optical quality and without significantly modifying the …

We first explore the operating principle and optical performances of dioptric-power and
astigmatism-variation lens doublets based on the LW Alvarez design. These fall within the …

We present a theoretical method for analyzing the first-order optics of stabilized zoom lenses
with two focal-length-variable elements. The zoom equations are established through the …

An efficient approach for the designing of ophthalmic lenses, based on the optimization of
the aspherical surface coefficients is presented. We show that five optimization constraints …

Traditional optical systems with variable optical characteristics are composed of several
optical elements that can be shifted with respect to each other mechanically. A motorized …

In this paper aberrations in Alvarez–Lohmann lenses are analyzed, and a semi-analytical
strategy for compensation is derived. An x–y polynomial model is used to describe the …

The theory of third-order aberrations for a system of rotationally symmetric aspheric thin
lenses and relations for calculation of the shape of rotationally symmetric aspheric spectacle …

We consider using the Alvarez lens concept to perform focal length change in conventional
optical systems. The Alvarez pair are a good example of freeform surfaces that are used to …