Collaborators and affiliated staff

Mr Tariq Aslam, Manchester Royal Eye Hospital

Dr Ian Murray, University of Manchester

Dr Declan McKeefry, University of Bradford

Prof Jan Kremers, University of Erlangen

Dr Anthony Robson, Moorfields Eye Hospital

Dr Sotiris Plainis, University of Heraklion

Prof Barry Lee, State University of New York

Memberships of committees and professional bodies

Association for Research in Vision and Ophthalmology (ARVO)

International Colour Vision Society (ICVS)

British Society for Clinical Electrophysiology of Vision

Methodological knowledge


Electroretinograms (ERGs); Visual Evoked Potentials (VEPs); Contrast Sensitivity; Asymmetric colour matching; Reaction times (RTs); Phase lag; Clinical Ophthalmic Electrophysiology

Software skills

Delphi (mainly); Visual Basic, C, Basic (Historically!)


Head of Ophthalmic Electrodiagnostic service at Manchester Royal Eye Hospital's Vision Science Centre

Honorary Visiting Professor of Vision Science, Faculty of Life Sciences, University of Bradford

Treasurer of the International Colour Vision Society (ICVS)

Board member of the British  Society for the Clinical Electrophysiology of Vision (BriSCEV)

My Google Scholar listing


BSc (Hons) Human Biology, Surrey, 1984

PhD Human Brain Electrophysiology, Victoria University of Manchester (UMIST), 1992

State-registered Clinical Scientist (SRCS) - HPC registration number CS02686

Research interests

Cone-isolating ERGs (Parry, Kremers, McKeefry, Murray)

Silent substitution allows us to stimulate a single class of photoreceptor, and investigate the retinotopic variability of cone density. Recent exciting work is helping us understand the ERG and how responses are coded at a single receptor level. See McKeefry et al (2014);  Kremers et al (2011, 2014); Challa et al (2010); Murray et al (2008); Murray et al (2004).

A novel compound ERG stimulus (Parry, Kremers, McKeefry, Murray, Panorgias, Lee)

Our novel stimulus contains chromatic and achromatic information.  Fourier analysis of the ERG shows the duplex nature of the retina; this is one of the few studies which reveal the properties of the post-ganglionic (M and P) visual pathways, even at an early stage in the visual pathway. See Parry et al (2012b).

Peripheral colour appearance (Parry, Murray, McKeefry, Panorgias)

We are getting a clearer understanding of peripheral retinal function by seeing how some colours are distorted when they are seen in the periphery. See Parry et al (2006); McKeefry et al (2007); Panorgias et al (2009, 2010, 2012a, 2012b); Murray et al (2012), Parry et al (2012a).

The role & measurement of macular pigment (Parry, Murray, Robson)

Macular pigment (MP) may protect against age-related macular degeneration (AMD). We use the VEP to measure MP distribution, and have developed a novel 'PIG' stimulus, accounting for MP to improve selectivity in studies of blue-yellow vision. We are investigating how supplementation can affect vision in elderly patients at risk of AMD. See also Robson & Parry (2008).

Colour Memory (McKeefry, Parry, Nemes)

See Nemes et al (2012).

Reaction times and visual sensitivity (Parry, Murray, McKeefry, Plainis)

See Parry et al (2008)

Complex spatial stimuli (Plainis, Parry, Murray)

See Plainis et al (2009)

Visual testing using tablet PCs (Aslam, Murray, Parry)

See Aslam et al (2013)

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