Ophthalmology Commons^™

Direct Multiplexing Of Low Order Aberration Modes In A Photopolymerbased Holographic Element For Analog Holographic Wavefront Sensing, Emma Branigan, Suzanne Martin, Matthew Sheehan, Kevin Murphy

Conference Papers

The fabrication of an analog holographic wavefront sensor, capable of detecting the low order defocus aberration, was achieved in an acrylamide-based photopolymer. While other implementations of holographic wavefront sensors have been carried out digitally, this process utilises a recording setup consisting only of conventional refractive elements so the cost and complexity of holographic optical element (HOE) production could be much reduced. A pair of diffraction spots, corresponding to a maximum and minimum amount of defocus, were spatially separated in the detector plane by multiplexing two HOEs with different carrier spatial frequencies. For each wavefront with a known aberration that was …

Optimisation Of The Performance Of Holographic Beam-Shaping Diffractive Diffusers Through Refinement Of The Recording Process, Cara Jones, Suzanne Martin, Sanjay Keshri, Dervil Cody, Kevin Murphy

Conference Papers

Optical diffusers have uses in laser applications and machine vision. Typical fabrication at a commercial level requires master production and the stamping/copying of individual elements at scale. This expensive, indirect process inhibits custom diffusers at reasonable cost. Previously the authors published a novel, direct, single beam method of recording customizable and controllable volume holographic diffusers by manipulating laser speckle and recording the pattern in photopolymer. This method allows for beam-shaping to produce diffusion patterns of various sizes and shapes. In this work, the direct method of recording controllable holographic diffusers is refined to improve diffuser performance (i.e., a decrease in …

Primary School Vision Screening Involving Teachers In Nampula, Mozambique, Aoife Phelan, Lisa O'Donoghue, Kathryn Saunders, Stephen Thompson, Vivien Ocampo, Kevin Naidoo, James Loughman

Conference Papers

Purpose: There is no plan for a national child eye care programme or existing human resource infrastructure to address the immediate challenge of child eye health in Mozambique.This study aims to design, implement and evaluate a school based pediatric vision screening service, to identify those in need of eye care services, among Mozambique’s 11,561,000 children.

Methods: Primary School Screening took place in three schools in Nampula, Mozambique in September 2010 and March 2011. The children’s vision was screened by an optometry student, optometrist or teacher with Log MAR ETDRS letters at 4 Meters. Ophthalmoscopy was performed on all children by …

The Mozambique Eyecare Project: Implementing A Model That Addresses Uncorrected Refractive Error In Lusophone Africa., Stephen Thompson, Diane Wallace

Conference Papers

BACKGROUND

Optometric education and resources are drastically deficient in most of Africa, more so in Lusophone Africa where the problem is compounded by language barriers which isolate these countries from related developments in Africa and/or the developed world.

The Mozambique Eyecare Programme is a multi-partner collaboration between The International Centre for Eyecare Education (ICEE), Universidade Lúrio in Mozambique, Technological University Dublin, and the University of Ulster in Ireland, designed to address the need for optometric education in Lusophone Africa.

AIM

This paper aims to document the current situation with regards to human resource development in eyecare in Mozambique and offer …