Binocular visual function and fixational control in patients with macular disease: A review.

Autor: Sverdlichenko I; Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada., Mandelcorn MS; Krembil Research Institute, Donald K Johnson Eye Institute, University Health Network, Toronto, Ontario, Canada.; Department of Ophthalmology and Vision Sciences, Toronto Western Hospital, Toronto, Ontario, Canada., Issashar Leibovitzh G; Krembil Research Institute, Donald K Johnson Eye Institute, University Health Network, Toronto, Ontario, Canada., Mandelcorn ED; Krembil Research Institute, Donald K Johnson Eye Institute, University Health Network, Toronto, Ontario, Canada.; Department of Ophthalmology and Vision Sciences, Toronto Western Hospital, Toronto, Ontario, Canada., Markowitz SN; Krembil Research Institute, Donald K Johnson Eye Institute, University Health Network, Toronto, Ontario, Canada.; Department of Ophthalmology and Vision Sciences, Toronto Western Hospital, Toronto, Ontario, Canada., Tarita-Nistor L; Krembil Research Institute, Donald K Johnson Eye Institute, University Health Network, Toronto, Ontario, Canada.
Jazyk: angličtina
Zdroj: Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) [Ophthalmic Physiol Opt] 2022 Mar; Vol. 42 (2), pp. 258-271. Date of Electronic Publication: 2021 Dec 04.
DOI: 10.1111/opo.12925
Abstrakt: For normally sighted observers, the centre of the macula-the fovea-provides the sharpest vision and serves as the reference point for the oculomotor system. Typically, healthy observers have precise oculomotor control and binocular visual performance that is superior to monocular performance. These functions are disturbed in patients with macular disease who lose foveal vision. An adaptation to central vision loss is the development of a preferred retinal locus (PRL) in the functional eccentric retina, which is determined with a fixation task during monocular viewing. Macular disease often affects the two eyes unequally, but its impact on binocular function and fixational control is poorly understood. Given that patients' natural viewing condition is binocular, the aim of this article was to review current research on binocular visual function and fixational oculomotor control in macular disease. Our findings reveal that there is no overall binocular gain across a range of visual functions, although clear evidence exists for subgroups of patients who exhibit binocular summation or binocular inhibition, depending on the clinical characteristics of their two eyes. The monocular PRL of the better eye has different characteristics from that of the worse eye, but during binocular viewing the PRL of the better eye drives fixational control and may serve as the new reference position for the oculomotor system. We conclude that evaluating binocular function in patients with macular disease reveals important clinical aspects that otherwise cannot be determined solely from examining monocular functions, and can lead to better disease management and interventions.
(© 2021 The Authors. Ophthalmic and Physiological Optics published by John Wiley & Sons Ltd on behalf of College of Optometrists.)
Databáze: MEDLINE
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