If a visually impaired app user can customize their iOS keypad, you might think they'd select the biggest possible keys.
"It turns out many of the low vision and blind users had best success with very small, very close keyboards and a tiny cursor for more responsive audio navigation feedback." says Gross.
Listening for VoiceOver to call out keys removes the difficulty of seeing to press the right ones. Blind users also liked the app's "hover" voice, a secondary voice to distinguish key location from final selection.
Gross said some low-vision users did prefer large, high-contrast keys. RocketKeys provides 3 color schemes with 3 additional contrast variations available through "Invert Colors," an iPad accessibility setting. Adjusting cursor size and "opacity" helped, too, Gross says.
RocketKeys provides a range of keyboard options, including the standard layout, alphabetical, and a specially created one called Optimus, designed for typing with the fewest possible hand movements.