Effects of Prism Eyeglasses on Objective and Subjective Fixation Disparity

PloS One
Volkhard SchrothWolfgang Jaschinski

Abstract

In optometry of binocular vision, the question may arise whether prisms should be included in eyeglasses to compensate an oculomotor and/or sensory imbalance between the two eyes. The corresponding measures of objective and subjective fixation disparity may be reduced by the prisms, or the adaptability of the binocular vergence system may diminish effects of the prisms over time. This study investigates effects of wearing prisms constantly for about 5 weeks in daily life. Two groups of 12 participants received eyeglasses with prisms having either a base-in direction or a base-out direction with an amount up to 8 prism diopters. Prisms were prescribed based on clinical fixation disparity test plates at 6 m. Two dependent variables were used: (1) subjective fixation disparity was indicated by a perceived offset of dichoptic nonius lines that were superimposed on the fusion stimuli and (2) objective fixation disparity was measured with a video based eye tracker relative to monocular calibration. Stimuli were presented at 6 m and included either central or more peripheral fusion stimuli. Repeated measurements were made without the prisms and with the prisms after about 5 weeks of wearing these prisms. Objective and subjective fixat...Continue Reading

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Citations

Nov 2, 2018·PloS One·Clara MestreJaume Pujol
Aug 25, 2018·Journal of Healthcare Engineering·Laura CercenelliEmanuela Marcelli
Mar 23, 2021·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Maryam MirzaeianMehdi Khabazkhoob

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