Worldwide, more than one billion people suffer from poor vision because they do not have
the eyeglasses they need. Their uncorrected refractive errors are a major cause of global …

Microinjection molding is a mass production method to fabricate affordable optical
components. However, the intense nature of this process often results in part deformation …

Purpose To introduce a novel autorefractor design that is intended to be manufacturable at
low cost and evaluate its performance in measuring refractive errors. Methods We …

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 …

In this work, we apply the Alvarez–Lohmann principle for varifocal lenses to diffractive off-
axis elements tuned by rotation. Two methods to combine multiple elements into arrays are …

We present design and manufacture of a 3D printed varifocal freeform optics. The optical
refraction power can be tuned continuously by mutual rotation of two helically shaped lens …

We present the design of a varifocal freeform optics consisting of two lens bodies each with
a helical-type surface structure of azimuthally varying curvatures. This arrangement allows …

Dioptric power measurement is classically achieved using manual focimeters. In this
contribution, we present vectofocimetry as a novel methodology to be easily implemented in …

This paper describes the application of a modeling approach for precise optical performance
prediction of free-form optics-based subsystems on a demonstration model of an eye …

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 …