The Mallett Fixation Disparity Test: influence of test instructions and relationship with symptoms

doi:10.1111/j.1475-1313.2006.00385.x

PMID: 16918777DOI: 10.1111/j.1475-1313.2006.00385.xAug 22, 2006Paper

The Mallett Fixation Disparity Test: influence of test instructions and relationship with symptoms

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)

Rajula Karania, Bruce J W Evans

Abstract

Fixation disparity is a minute ocular misalignment under conditions of binocular single vision and is typically detected in primary eye care practices in the UK using the Mallett Unit Fixation Disparity Test. This instrument creates natural viewing conditions, when the patient's binocular system is fused using both central and peripheral fusion locks. This allows the examiner to determine the minimum prism power that eliminates the fixation disparity: the associated phoria or aligning prism. The spherical power that eliminates the fixation disparity, the aligning sphere, can also be determined. The near Mallett Unit Fixation Disparity Test has been shown to have good sensitivity and specificity for detecting symptomatic heterophoria. Cases of decompensated heterophoria tend to have a fixation disparity and the aligning prism or aligning sphere is a good indicator of the correction that will render the heterophoria compensated. The purpose of this study was, for the first time, to investigate the effect of test instructions on the results of the Mallett Unit Fixation Disparity Test. In study 1, we surveyed and observed practitioners to determine the instructions that are typically used. In study 2, we compared results obtained w...Continue Reading

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