Share Email Print

Optical Engineering

Power-adjustable sphero-cylindrical refractor comprising two lenses
Author(s): Sergio Barbero; Jacob Rubinstein
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

The need for affordable and sustainable ophthalmic systems for measurement and correction of refraction is well recognized. Power-adjustable spectacles based on the Alvarez principle (transversal lateral movement of two lenses) have emerged as an innovative technology for this purpose. Within this framework, our aim is to design a new power-adjustable sphero-cylindrical refractor. The system is comprised of two lenses and three independent lateral movements. The lenses have a planar and a third-degree polynomial surface. They are arranged with their planar surfaces in contact, so that the incoming light is only refracted by two surfaces. First, we present the theory of such a system. Second, we propose an optical design methodology. Third, we provide a design example capable of measuring sphere powers ranging from −5.00 D to +5.00 D and cross-cylinders from −2.00 D to 2.00 D. Finally, a prototype of the lenses was manufactured using free-form machining.

Paper Details

Date Published: 18 June 2013
PDF: 10 pages
Opt. Eng. 52(6) 063002 doi: 10.1117/1.OE.52.6.063002
Published in: Optical Engineering Volume 52, Issue 6
Show Author Affiliations
Sergio Barbero, Consejo Superior de Investigaciones Científicas (Spain)
Jacob Rubinstein, Technion-Israel Institute of Technology (Israel)

© SPIE. Terms of Use
Back to Top