Thin spectacles for myopia, presbyopia and astigmatism insensitive vision

Abstract

The aim of the presented research was to develop special spectacles capable of solving common ophthalmic problems as myopia, presbyopia and regular/irregular astigmatism. The method included adapting special all-optical extended depth of focus concept, taken from the field of digital imaging, to ophthalmology, and by that providing the required vision solutions. Special thin mask containing annular like replicated structure (thickness of the structure is less than one micron) was designed and proven to provide extended depth of focus. In this paper we present several experimental results as well as trials with volunteers. The testing included measuring the visual acuity under different illumination conditions (pupil size varied from 2 up to 4mm), as well as stereoscopy, color integrity, field of view and contrast. The results demonstrate improvements of up to 3 Diopters (for presbyopic that require the bifocal or the progressive lens solutions) for pupil sizes of 2-4mm. The approach has demonstrated improvement of more than 2 Diopters for regular as well as irregular astigmatism. The main advantage of the developed optical element is that it is very thin (less than few microns) and has low price, it has high energetic throughput and low chromatic aberrations and it operates over the full field of view while providing continuously focused image (in contrast to bifocal lenses having only 2 focused regions). The element also provides a solution for regular as well as irregular astigmatism that currently has no available treatment.

Use of a cubic phase plate as solution for moderate astigmatism: preliminary study

“…Como resultado a destacar vemos que cerca del 80% de los encuestados manifestó ser capaz de identificar la línea de letras de AV 0.1 logMAR o superior, para cualquier diámetro pupilar y orientación de astigmatismo hasta 2D de magnitud. Frente a los trabajos previos realizados por Zalesvky et al [9] que proponían el uso de una lámina de fase binaria que se colocarían sobre una lente oftálmica de forma que gracias a efectos difractivos se consiguiera extender la profundidad de foco y corregir el astigmatismo, en este trabajo abordamos la viabilidad del uso de láminas de fase cúbica para tal fin. Dicha propuesta fue lanzada inicialmente por Cathey [7], sin embargo no llego a concretar la demostración de la misma.…”

“…Cathey propuso la posibilidad de emplear una LFC en el campo de la óptica oftálmica para mejorar la visión de sujetos con aberraciones oculares [7], considerando que la decodificación de la imagen sería realizada por el cerebro [8]. Trabajos previos realizados por Zalevsky et al [9] demostraron que la extensión de la profundidad de foco se puede usar para corregir presbicia, miopía, hipermetropía y astigmatismo. En este sentido, hemos publicado recientemente [10] un estudio sobre el uso potencial de láminas de fase cúbica como las empleadas en la técnica de WFC para mejorar la visión de sujetos présbitas.…”

Nanophotonics for optical super resolution from an information theoretical perspective: a review

“…98 and 99 was used to fabricate spectacles, soft contact lenses as well as intraocular lenses (IOLs) [100][101][102][103][104] in which the profile of the lens is such that the different spatial regions of the wave front that are passing through the eye pupil (and therefore through the contact lens/spectacle or the IOL with the engraved profile) are encoded in such a way that when they are all added together in the focal plane their interference (i.e. their addition) will generate more or less as sharp focal point as produced by the regular mono focal lens in its focal plane.…”

“…The maximal engraving depth is less than one micron and the spatial transversal features of the profile are as large as tens of microns. The optical element has annular-like structure (a small number of annular, it is not a Fresnel zone plate) [100].…”

Clinical trials of interference-based extended depth of focus intra ocular lens design

“…The solution presented in this paper produces continuously focused vision over the full required range that in regular eye is covered by accommodation of 3.00D (from near range of 33cm and up to infinity) [11][12][13]. All this is obtained with static element with high energetic efficiency and without any need of applying force by the mussels of the eye.…”