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Evaluation of error in the performance of power corrected ophthalmic lenses

Trujillo-Schiaffino G, Salas-Peimbert D P, Anguiano-Morales M, Malacara-Doblado D, Vega-Pineda J

Optica Applicata

2013

Vol. 43, nr 2

s. 261--270

In this work, we describe a new method for assessing the refractive correction error in power corrected ophthalmic lenses. The ideal power distribution map corresponding to the lens design to be measured is initially obtained. Then, using some known techniques, the real power distribution map of the lens under test is obtained. Finally, the difference between the two distributions is computed, obtaining a distribution map of the refractive correction error of the lens under analysis. In the paper, we describe the implementation of the proposed method using the Hartmann test to analyze a corrected power ophthalmic lens. The technique is analyzed, and its effects on measurement resolution discussed. This method can be useful to verify the designing errors in the lab or to verify manufacturing errors of ophthalmic lenses during mass production.

Liquid lens; an advancement in optical communications

Casey P.

Journal of Automation Mobile Robotics and Intelligent Systems

2007

Vol. 1, No. 2

67-70

"Liquid lens" technologies promise significant advancements in machine vision and optical Communications systems. Utilizing two isodensity liquids with differing electrical characteristics to focus, liquid lenses require no moving parts for operation. Liquid lenses also offer Iower power consumption and smaller package sizes than their electromechonical counterparts. Liquid lenses are quickly becoming a viable alternative to conventional lens technologies for a wide variety of applications. Notable variations of liquid lens technology are discussed. A machine vision student project utilizing this technology will be discussed in detail. An adaptotion of the machine vision project for use in human vision correction, and independent research in optical Communications are also used to exemplify the versatile nature of this technology.