Abstract

DO.18.06

The influence of the daytime on the squint angle

Daenicke L., Bau V., Duncker G. I. W. 
Klinik und Poliklinik für Augenheilkunde der Martin-Luther-Universität Halle-Wittenberg

Objective: Clinical experience shows that squint angle in many cases can be variably. In this study the influence of time of day should be analysed.
Methods: In a prospective clinical study including 143 patients (convergens=76, divergens=67) with central fixation squint angles where measured by means of Maddox-cross in 1 meter distance and alternating prism cover test in 33 cm and 5 meters at different times of day (8-10, 12-14, 17-21 o’clock).
Results: A significant increase of squint angles by near fixation (APCT 33 cm) could be shown, but not in APCT 5 meters and Maddox-cross. This is valid as well in convergent as in divergent deviation. In 106 patients (74%) we analysed squint angle variation in APCT 33 cm, it varies around 4,6 cm/m. In convergent deviations this effect could only be shown in non-operated patients. A special effect was pointed out in divergent squinting patients with binocular function. Other interacting factors could not be identified.
Conclusions: In course of day a significant und clinical relevant increase of squint angle was shown on near fixation in all subtypes of concomitant strabism. The available results underline the necessity of multiple measurements particularly in different day times.

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