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Yvonne Hsu-Lin Luo, Joe Zhong, Francesco Merlini, Fatima Anaflous, Maura Arsiero, Paulo E Stanga, Lyndon Da Cruz; The use of Argus® II Retinal Prosthesis to Identify Common Objects in Blind Subjects with Outer Retinal Dystrophies. Invest. Ophthalmol. Vis. Sci. 2014;55(13):1834.
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© ARVO (1962-2015); The Authors (2016-present)
To determine the usefulness of the Argus® II Retinal Prosthesis in assisting blind subjects (from outer retinal dystrophies) to identify a range of common real-life objects.
Eight subjects with light perception vision received the Argus® II implant. Internally controlled, closed-set, forced-choice tests on identification of eight common objects (as chosen by the subjects) were performed. The objects were first presented in the solid form (see Figure 1), then in the outlined form (see Figure 2). The tests were performed with the Argus® II device set in one of the 3 conditions: a) device on (standard mode), b) device in "scrambled” mode (positive control); and c) device off (negative control).
For Solid Objects, the mean % of correct identification ± S.D: 1. Device on = 32.8 ± 15.7% 2. Device in "scrambled mode" = 26.2 ± 12.5% 3. Device off = 12.5 ± 6.7% (P = 0.02, Friedman Test) For Outlined Objects, the mean % of correct identification ± S.D: 1. Device on = 41.4 ± 17.7% 2. Device in "scrambled mode" = 20.7 ± 12.4% 3. Device off = 9.4 ± 7.5% (P = 0.005, Friedman Test) The mean % of correct identification of device on versus device in “scrambled mode” was only significant for Outlined Objects, but not for Solid Objects. (P = 0.002 and 0.193 respectively, Wilcoxon Signed Rank Test)
The Argus® II system allowed blind subjects to identify common real-life objects more accurately with the device on than off. This accuracy could be improved by enhancing the outlines of the objects. This finding has practical implications in terms of modifying the subjects’ environment, and allowing future development in image processing to maximize the subjects’ performance with the device.
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