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Philip M. Bronstad, Eli Peli, Amy Doherty, Anne B Fulton; Strabismic hemianopic field expansion and mobility. Invest. Ophthalmol. Vis. Sci. 2017;58(8):3294. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
We document several ways that hemianopic visual fields can be expanded by strabismus. We hypothesized that patients with strabismus would have better mobility than those without field expansion, and that more expansion, especially when stimuli in the expanded field are perceived in the correct directions, would enable better mobility.
Seven hemianopic patients (ages 15 y.o. to 24; hemianopia onset perinatal to 17) were tested for their ability to detect peripheral pedestrians in a driving simulator and in a walking simulator. Pedestrians represented potential collisions and could appear within the blind, seeing, or expanded visual field. Dichoptic visual fields were measured and standard clinical tests were used. Suppression was measured using standard clinical tests and an in-house developed anaglyph system with red and green lasers and variable neutral density filters.
Three participants had strabismic visual field expansion with while the other four did not. Those withfield-expansion detected mobility relevant stimuli presented to their blind hemifields more often (150/191pedestrian appearances), than those without field expansion (155/264 pedestrians), X2=19.7, p<0.01.
Hemianopic visual field may be expanded with strabismus in a variety of implementations, all of which haveutility improved over hemianopia. Greater field expansion and anomalous correspondence are both associated with improved performance on hazard detection tasks.
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
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