The amount of prism required to eliminate a fixation disparity. It represents the prism power needed to compensate for the misalignment of the visual axes under binocular viewing conditions. Associated phoria is typically measured using a fixation disparity test, such as the Mallett unit or the Bernell lantern with a polarized fixation disparity target. The associated phoria helps guide the prescription of prismatic corrections for symptomatic patients with binocular vision disorders.
The amount of prism required to eliminate a fixation disparity. It represents the prism power needed to compensate for the misalignment of the visual axes under binocular viewing conditions. Associated phoria is typically measured using a fixation disparity test, such as the Mallett unit or the Bernell lantern with a polarized fixation disparity target. The […]
associated phoria
Sources
Frantz, K.A. (2020) ‘Prescribing Prism with Prowess’, Review of Optometry. Available at: https://www.reviewofoptometry.com/article/prescribing-prism-with-prowess (Accessed: 4 May 2024).
Karania, R. and Evans, B.J.W. (2006) ‘The Mallett Fixation Disparity Test: influence of test instructions and relationship with symptoms’, Ophthalmic and Physiological Optics, 26(5), pp. 507–522.
Mallet, R.F.J. (1964) ‘The investigation of heterophoria at near and a new fixation disparity technique’, Optician, 148, pp. 547–551.
Press, L.J. (2020) ‘The Art of Prescribing Low Amounts of Prism’, Optometric Clinical Practice, 2(2). Available at: https://athenaeum.uiw.edu/optometric_clinical_practice/vol2/iss2/2 (Accessed: 4 May 2024).