The overall aim of this study was to assess how the processing of different stimulus attributes in human vision is affected by ageing and disease. Both foveal and paracentral regions of the retina were investigated, with emphasis on both pregeniculate and postgeniculate impairme…
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The core function of optometrists is the prescribing of spectacles in order to alleviate symptoms and improve visual function. Most commonly, the spectacles are used to correct refractive errors and, less frequently, they are also used to correct a decompensated heterophoria. Wh…
Computers have become ubiquitous in the modern world and most people spend several hours each day viewing computer displays. With the advent of LCD flat panel displays and the increase in graphical processing power, computer displays have rapidly evolved from barely legible text…
In the UK, 20-50% of older people have undetected reduced vision and in most of these cases the poor vision can be readily corrected by new spectacles and/or cataract surgery. It is often assumed that older people with vision loss will have regular eye examinations so that these…
In this thesis the laser ray tracing (LRT) technique for measurement of ocular aberrations has been implemented, validated and applied, in conjunction with complementary techniques, to the study of ocular aberrations in human eyes. In particular, we studied optical aberrations i…
A literature review revealed a lack of systematic research investigating standards of clinical practice within optometry. Three main approaches have been used to evaluate the content of clinical consultations: abstraction of clinical records, clinical vignettes and unannounced s…
Nystagmus is a disorder of eye movement characterised by irregular, uncontrolled and repetitive eye movements. It can occur in a broad spectrum of clinical situations and diseases or it may occur in isolation and an inherited disorder. Surprisingly little is known about the unde…
The application of multifocal techniques to the visual evoked cortical potential permits objective electrophysiological mapping of the visual field. The multifocal visual evoked cortical potential (mfVECP) presents several technical challenges. Signals are small, are influenced …