Apparatus for testing the extra-ocular eye muscles

摘要

The apparatus, which tests the eye muscles by a combination of motility and near and far fixation, comprises a larger card bearing eight numbers arranged radially as shown and a smaller card also bearing eight numbers and having an aperture through which the larger card is viewed. The subject stands 1 m. from the larger card and about 20 cm. from the smaller card and recites the numbers in a clockwise direction alternating between the near and far cards, the time taken to do this providing a comparative measure of muscle physiology. Also disclosed is apparatus comprising an array of illuminatable diodes, a microprocessor and infra-red, eye movement-detecting "spectacles", the arrangement being such that as each diode swiches on, the subject looks towards it to switch it off as quickly as possible.