VISION TESTING FOR ASTIGMATISM

摘要

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.

主权项

1. A computer implemented method of testing astigmatism of a subject, said method comprising:
displaying on a display device a graphical user interface including a plurality of differently coloured parallel bars in an initial position against a contrasting background; controlling movement of the bars from the initial position to cause at least one of a separation of the bars and joining of the bars; detecting an indication of the subject of separation and joining of the bars respectively; and recording a measure of movement of the bars from the initial position to the detected indication.