| 摘要 |
A method of testing applicable to the provision of a vision aid, such as a tinted transparent plastic overlay for placement over textual matter to be read, or the selection of a tint for a vdu screen, to assist in amelioration of symptoms in dyslexia and related and other optical and related disorders, is based upon a quantitative approach to the identification of the colorimetric parameter within the three dimensions of colour space applicabl e to the vision aid for optimal patient visual performance. The invention provides a test procedure in which a numerical value (the benefit value) is associated with a given value of each of the three colorimetric parameters, and a short series of similar tests on differing colorimetric parameters enables the optimum value to be interpreted whereby the optimal value may we ll not be a value actually tested. Test tasks are strictly separated into array tasks and non-array tasks.
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