The aim of this work is the characterization of a Shack-Hartmann wavefront sensor prototype through a statistical analysis in accordance with the official Mexican standard. To determine the repeatability and reproducibility of ophthalmic aberration measurements, given in Zernike polynomials, a measurement protocol was proposed. The measurements were obtained using an experimental optical system, which uses a super luminescent diode (SLD) IR, as well as ophthalmic trial lenses to introduce optical aberrations, which are used as reference materials. The complete optical system is intended to be used as an experimental aberrometer to obtain low order aberrations of the human eye in vivo.
Presbyopia correction involves different types of studies such as lens design, clinical study, and the development of objective metrics, such as the visual Strehl ratio. Different contact lens designs have been proposed for presbyopia correction, but performance depends on pupil diameter. We will analyze the potential use of a nonsymmetrical element, a cubic phase mask (CPM) solution, to develop a contact or intraocular lens whose performance is nearly insensitive to changes in pupil diameter. We will show the through focus optical transfer function of the proposed element for different pupil diameters ranging from 3 to 7 mm. Additionally, we will show the images obtained through computation and experiment for a group of eye charts with different visual acuities. Our results show that a CPM shaped as 7.07 μm*(Z33−Z3−3)−0.9 μmZ20 is a good solution for a range of clear vision with a visual acuity of at least 0.1 logMar from 0.4 to 6 m for pupil diameters in the 3- to 7-mm range. Our results appear to be a good starting point for further development and study of this kind of CPM solution for presbyopia.
Wavefront coding (WFC) enables the depth of field of incoherent optical systems to be extended. This method involves a cubic-phase plate in the system yielding a blurred image nearly invariant to defocus. In visual optics there is a big interest in improving solutions for two different problems: Presbyopia correction and high resolution retinal images with low cost devices. In this work we will show how the use of cubic phases in contact lenses can be an alternative to multifocal lenses and how WFC technique can be applied to record high resolution retinal images reducing the complexity of the actual systems
USC-OSA is a student chapter whose objective is to bring Optics knowledge closer to the non-optics community. The activity developed at the Hospital school was one of the most important last year. It was consisted in a few Optics experiments and workshops with hospitalized children of different ages and pathologies. The experiments had to be adapted to their physical conditions with the aim of everyone could participate. We think this activity has several benefits including spreading Optics through children meanwhile they have fun and forget their illness for a while.
KEYWORDS: Photonics, Projection systems, Astronomy, Mirrors, Colorimetry, Linear filtering, Social networks, Prisms, Optical filters, Education and training
The USC-OSA Student Chapter has been constituted in March 2013 by members of the University of Santiago de
Compostela (USC) in Spain and sponsored by The Optical Society of America (OSA). It is formed by five graduate and
one undergraduate students with the common interest in Optics and Photonics research and a professor of the USC is
also involved as a faculty advisor. We decided to start this group with the aim of involving kids, precollege and
undergraduate students in the world of Optics and Photonics. The activities that the USC-OSA Student Chapter members
intend to realize are mainly educational tasks for the spreading of knowledge in Photonics by means of basic
experiments, demonstrations and lectures by leading researchers and teachers. Most of the needed resources to
accomplish these activities are provided by the OSA, such as educational posters and a portable kit for demonstrating
Optics to students. At this moment the USC-OSA Student Chapter is carrying out several activities, as educational
journeys at the Santiago de Compostela University Hospital Complex (CHUS), where hospitalized children can approach
to Optics through some simple experiments and games. A teaching program is also being organized in collaboration with
Galician secondary schools in order to show students the importance and uses of Optics and Photonics and to arouse
their interest in this field, as well as encouraging them to develop their scientific thinking. Another activity will take
place in November during the Science Week, which includes a program of lectures targeted to undergraduate students
and an exposition of several demonstrations
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