Here’s a great example of designing something for an impaired population, and making an improvement that benefits all. Mastercard has redesigned their debit, credit and pre-paid cards with different physical notches in them—round, trapezoidal and checkmark-shaped—so that the visually impaired can distinguish them by touch.
Listen beautiful relax classics on our Youtube channel.
The additional benefit, of course, is that everyone will be able to use the off-center notches to accurately orient the cards, by touch, when inserting them into a machine.
I’d like to see a little more differentiation between the shapes, but I guess there’s only so far they can take it with the material.