GLOBAL VISION 2020 BLOG →

You can explore previous publications and posters from the Centre by browsing the list below. Be sure to check back regularly for new publications.

Papers

		Reproducibility of sphero-cylindrical prescriptions G. E. Mackenzie, Ophthalmic and Physiological Optics, Vol 28 (2008) Abstract: "Purpose: To investigate the reproducibility of the sphero-cylindrical prescriptions provided by 40 optometrists. Methods: Forty registered optometrists were randomly selected from the cities of Oxford and Westminster in the UK to perform a sphero-cylindrical refraction on an asymptomatic 29-year-old male subject. The 95% limits of reproducibility for each component of refraction were assessed and are presented together with scatterplots, distribution ellipsoids and polar profiles of dioptric power. Results: The mean stigmatic (spherical equivalent) refraction for the right eye was -0.83 D (S.D. = 0.28 D) with 95% limits of agreement -1.38 and -0.28 D. The 95% reproducibility limits for stigmatic data [1.96 (root 2) (S.D)] was 0.78 D. The average inter-ocular difference in the stigmatic components of refraction was -0.044 D (S.D. = 0.20 D) but estimates ranged from -0.50 to +0.50 D. Mean ortho- and oblique antistigmatic refractions were -0.23 D (S.D. = 0.084 D) and -0.14 D (S.D. = 0.086 D) respectively. Conclusions: The findings of this paper suggest that refractions performed by multiple optometrists on a single eye will differ in their stigmatic component by over 0.78 D on average not more than once in 20 refractions. The reproducibility of refractions reported here, approximately twice as variable as those reported under repeatability conditions, has profound implications for the analysis of refractive data collected by multiple optometrists over the course of replication, longitudinal and epidemiological studies." CLICK HERE TO ACCESS THE ARTICLE →
		Self-optimised vision correction with adaptive spectacle lenses in developing countries M. G. Douali and J. D. Silver, Ophthalmic and Physiological Optics, Vol 24 (2004) Abstract: "It is estimated by the World Health Organization that about 1 billion people in the developing world would benefit immediately from distance vision and near vision correction if it were available to them. Here we address this problem and provide a solution by correcting vision in the field with adaptive liquid-filled variable focus lenses. We describe the details of the lens and present the results of a series of experiments performed in Ghana, Nepal, Malawi and South Africa that demonstrate that it is possible by simple means to self-determine and obtain correct refraction using such lenses." CLICK HERE TO ACCESS THE ARTICLE →
		How to use an adaptive optical approach to correct vision globally J.D. Silver, M.G. Douali, A.S. Carlson and L. Jenkin, South African Optometrist, Vol 63 (2003) Abstract: "It is estimated that about one billion people in the Developing World would benefit immediately from distance vision and near vision correction if it were available to them. Here we address this problem by correcting vision in the field with adaptive liquid filled variable focus lenses, and test whether it is possible by simple means to determine and obtain correct refraction using such lenses." CLICK HERE TO ACCESS THE ARTICLE →

Posters and Presentations

		Estimating the Global Need for Refractive Correction J.D. Silver, D.N. Crosby, G.E. MacKenzie, M.D. Plimmer Presented at Vision UK 2009, London, UK, June 2009 CLICK HERE TO VIEW THE POSTER →
		Vision Correction in the Developing World: Perhaps the largest application of Adaptive Optics? D.N. Crosby, M.G. Douali, G.E. Mackenzie, M.D. Plimmer, R. Taylor, J.D. Silver Presented at Adaptive Optics 2008, London, UK, October 2008 CLICK HERE TO VIEW THE POSTER →
		The Global Need for Refractive Correction J.D. Silver, D.N. Crosby, M.G. Douali, G.E. Mackenzie, M.D. Plimmer Presented at the IAPB 8th General Assembly, Buenos Aires, Argentina, August 2008 CLICK HERE TO VIEW THE POSTER →
		Repeatability and reproducibility of self-refraction using continuously adjustable fluid-filled spectacle lenses in pre-presbyopes G.E. Mackenzie, J.D. Silver, D.N. Crosby, M.J.A. Newbery, A.K. Robertson Presented at the ICEE World Conference on Refractive Error and Service Development, Durban, South Africa, March 2007 CLICK HERE TO VIEW THE POSTER →