Abstract: Method of calibrating a computerised colour vision test and method of testing colour vision on a computer The invention relates to a method of calibrating a colour vision test for testing colour vision under given ambient lighting conditions, which colour vision test is to be displayed on a colour display (12) of a computer (10) having at least one input interface (14), characterised by displaying a calibration test on the display (12) under given ambient lighting conditions to a person with normal colour vision before starting the colour vision test, displaying within at least one measuring region (31) of the display (12) a colour determination task requiring user input as a part of the calibration test, reading the user input through at least one input interface (14) of the computer (10), evaluating the read user input and determining as a result of the evaluation a display error resulting from a combination of a colour reproduction capability of the display (12) and an effect of the ambient lighting condit

Abstract: The object of the invention relates to a method of designing a colour filter for modifying human colour vision by defining the spectral transmission function of the colour filter such as to maximise colour discrimination between more than one element, colour sample, of a colour sample set when a targeted human eye, the colour vision of which is to be modified, is viewing the colour sample set with the colour filter, and at the same time such as to minimise the difference between the colour identification of the colour samples by the targeted eye and a reference eye having a reference colour vision. The object of the invention also relates to such a colour filter, such a colour filter set, and the use of such colour filter and a method for modifying human colour vision.

Abstract: Method for determining spectral sensitivity parameters of color-sensitive receptors in the eye, in the course of which at least one testing light beam is introduced onto an area of the retina of an eye to be tested, and at least one sensitivity parameter is determined by detecting a light beam reflected from the retina or by using color perception of the person tested. In addition to said at least one testing light beam, at least one auxiliary light beam of a wavelength falling outside the spectral sensitivity wavelength range of color-sensitive receptor or receptors to be measured is also introduced onto at least the same area of the retina, said at least one auxiliary light beam reducing the sensitivity of color-sensitive receptor or receptors not to be measured.

Abstract: A method and optical articles for improving or modifying human color vision by using a color filter with a spectral transmission .tau.(.lambda.) to compensate for differences between a spectral sensitivity P*(.lambda.), D*(.lambda.), T*(.lambda.) of an eye with impaired color vision and spectral sensitivity P(.lambda.), D(.lambda.), T(.lambda.) of an eye with normal color vision. The optical article may be realized as an eyeglass, a contact lens or an intraocular lens, or by any other optical implement placed between the eye and the object to be viewed.