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Correlation between Worth Four Dot Test Results and Fusional Control in Intermittent Exotropia
Mohammad Etezad Razavi1, Marzieh Najaran, Raheleh Moravvej
1Eye Research Center, Khatam-al-Anbia Hospital, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
Purpose:
To compare the results of Worth 4-dot test (WFDT) performed in dark and light, and at different distances, with fusional control in patients with intermittent exotropia (IXT).
Methods:
Dark and light WFDT was performed for new IXT subjects at different distances and the results were compared with level of office-based fusional control.
Results:
Fifty IXT patients including 17 male and 33 female subjects participated in the study. A significant difference (P<0.05) was observed between levels of home and office-based fusional control (P<0.05). A weak correlation was present between the results of WFDT and level of office-based fusional control; the highest agreement (Kappa=0.088) was observed with dark WFDT performed at a distance of 4m.
Conclusion:
Evaluation of fusional state by far WFDT, especially in a dark room, shows modest correlation with office-based fusional control in IXT patients and can be used as an adjunct to more complex tests such as far stereoacuity.
