Abstract: Disclosed are computer implemented methods for testing astigmatism which display differently colored bars against a contrasting background. In one implementation, parallel colored bars are separated and joined through various angles of rotation against a constant background. In another implementation one set of bars is formed by variable grating pattern which is rotated within an annulus of solid color bars, desirably against a contrasting intermediate background and a reference background having a linear grating pattern.

Abstract: A computer-implemented method for vision diagnosis for lens prescription retrieves vision test data recorded from a computer assisted vision test of a patient. The vision test data of the patient is assessed for suitability for vision diagnosis. Where suitable, the vision test data of the patient is analyzed to display a representation of at least a part of the patient data. The analyzed part of the patient data is then matched with corresponding data from previously optometrically assessed and diagnosed vision data covering a wide range of optical conditions. A diagnosis of the vision of the patient is then established from the matching.

Abstract: Disclosed are computer implemented methods for testing astigmatism which display differently coloured bars against a contrasting background. In one implementation, parallel coloured bars are separated and joined through various angles of rotation against a constant background. In another implementation one set of bars is formed by variable grating pattern which is rotated within an annulus of solid colour bars, desirably against a contrasting intermediate background and a reference background having a linear grating pattern.