Abstract
The simultaneous prism cover test is frequently used for measuring a manifest squint angle. In this paper an alternative method for measuring a manifest squint angle is described. While a subject fixes on a fixation object in near or far position, one eye illuminated from below with a collimated visible light beam. The light source is mounted on a holder which can be rotated around a vertical axis. The examiner observes the light reflexes of the anterior surface of the cornea and the posterior surface of the lens in the patients pupil and turns the holder until the images lie on a vertical line. In this case the direction of the incident light beam, which is determined by the position of the holder, and the direction of the optical axis of the eye coincide. For example, by measuring before and after covering, the difference in the measured light directions is the manifest squint angle, as determined by the simultaneous prism cover test.
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