Comparison of measured heterophoria with objective and subjective methods with attention to motor eye dominancy

1Instructor of Optometry, Health Promotion Research Center, School of Rehabilitation, Zahedan University of Medical Sciences and Health Services, Zahedan, Iran.

2MSc of Optometry, Tehran University of Medical Sciences and Health Services, Tehran, Iran

3BSc of Optometry, School of Rehabilitation, Zahedan University of Medical Sciences and Health Services, Zahedan, Iran.

4Instructor of Epidemiology, Health Promotion Research Center, School of Health, Zahedan University of Medical Sciences and Health Services, Zahedan, Iran.

5MSc of Optometry, Tehran University of Medical Sciences and Health Services, Tehran, Iran.

Zahedan Journal of Research in Medical Sciences:Vol. 13, issue 7; e93818

Published online:May 26, 2011

Article type:Research Article

Received:Aug 31, 2010

Accepted:Oct 19, 2010

How to Cite:Hamed Momeni-Moghaddam Farshad AsgarizadehMarzieh EhsaniHossein Ansaribatool HaghighiComparison of measured heterophoria with objective and subjective methods with attention to motor eye dominancy.Zahedan J Res Med Sci.13(7):e93818.

Abstract

Background: The one step in evaluation of binocular vision is determination of type and amount of deviation. For this purpose objective and subjective methods were used. The purpose of this study is was to compare the measured heterophoria with objective (cover test) and subjective methods (von Graefe, Maddox rod, phi phenomenon) considering motor dominancy.

Materials and Method: In this semi-experimental study, 100 students of Zahedan University of medical sciences who had inclusion criteria, selected, randomly. Refractive errors and dominant eye were determined by retinoscopy and hole in the card test, respectively. The deviation was measured objectively by using alternate prism cover test and subjectively by von Graefe, Maddox rod and phi phenomenon tests so dominant and nondominant eye were fixed alternatively. Data were analyzed in SPSS-15 software using repeated measurement of ANOVA and correlation tests.

Results: There were considerable statistical difference between different measurement methods considering the dominancy of fixator eye (p<0.001). In the correlation test, the most and least correlations were related to phi phenomenon (dominant eye fixator) and phi phenomenon (non dominant eye fixator) and von Graefe and phi phenomenon (with dominant eye fixator), respectively.

Conclusion: The most accurate heterophoria measurement methods were phi phenomenon, cover test, Maddox rod and von Graefe, respectively. Although accuracy of phi phenomenon was more than other methods in determination of deviation, because subjective methods cannot be used in all conditions, cover test is the best method in measuring eye deviation. Also, measured deviations in all of methods were lower when dominant eye was fixator.

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