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We present a set of 8 thumb-to-finger microgestures (TTF µGestures) that can be used as an additional modality to enrich touch interaction in eyes-free situations. TTF µGestures possess characteristics especially suited for people with visual impairment (PVI). They have never been studied specifically for PVI to improve accessibility of touchscreen devices. We studied a set of 33 common TTF µGestures to determine which are feasible and usable without seeing while the index is touching a surface. We found that the constrained position of the hand and the absence of vision prevent participants from being able to efficiently target a specific phalanx.
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Faisandaz et al. (2022) studied this question.