Abstract: A method of assessing the effect of viewing varying colours of light on a subject's perception of tinnitus, comprising the steps of: presenting a display in at least part of the subject's field of view; illuminating the display with coloured light in the visible spectrum using one or more variable sources, varying measurable values of the coloured light illuminating the display; and recording the measurable values of the coloured light illuminating the display at which the subject indicates a change in their perception of tinnitus.

Abstract: A method of assessing the effect of viewing varying colours of light on a subject's perception of tinnitus, comprising the steps of: presenting a display in at least part of the subject's Held of view; illuminating the display with coloured light in the visible spectrum using one or more variable sources, varying measurable values of the coloured light illuminating the display; and recording the measurable values of the coloured light illuminating the display at which the subject indicates a change in their perception of tinnitus.

Abstract: A method of assessing the effect of viewing varying colours of light on a subject's perception of tinnitus, comprising the steps of: presenting a display in at least part of the subject's field of view; illuminating the display with coloured light in the visible spectrum using one or more variable sources; varying measurable values of the coloured light illuminating the display; and recording the measurable values of the coloured light illuminating the display at which the subject indicates a change in their perception of tinnitus.

Abstract: Apparatus and a corresponding method for the diagnosis and alleviation of symptoms of visually induced physiological defects and/or pathological conditions is provided. A plurality of narrow-band light sources are combined to constitute a color controllable lamp. A method for adjusting the settings of this lamp permits the optimum illumination for a particular subject to be found, whilst the latter carries out a task such as reading or writing. By use of the lamp to simulate the expected visual stimulus, to which the subject would be exposed if provided with viewing aids such as tinted spectacles and the like, an optimal selection from a database of such aids may be made or a new formulation defined. Inter alia, the symptoms of visual dyslexia, macular degeneration and visually induced migraine may be alleviated.

Abstract: Apparatus and a corresponding method for the assessment of the effects of tinted illumination on a subject's visual system is provided. Colour controllable light sources provide the illuminant for an object field comprising features viewed against a background. A practitioner or the subject can effect movement of a feature such as a symbol or a ball. The subject views the feature at different locations and/or whilst in motion, having selected a tint for evaluation of visual comfort or performance. Some embodiments of the invention may be used to assess the effects of optimising tint for subjects who suffer from visual dyslexia or other impairments of the visual system. Other embodiments are directly operable by the subject in order to help the subject to select tinted eyewear for the enhancement of his or her visual performance.