Atkinson Hyperlegible

Atkinson Hyperlegible is a freely available typeface built around a grotesque sans-serif core, intended to be optimally legible for readers who are partially visually impaired, with all characters maximally distinguishable from one another.

It was developed by the Braille Institute of America in collaboration with Applied Design Works and is available under the SIL Open Font License.

[3] Applied Design Works looked for a typeface that would suit the Braille Institute's needs but were unable to find one.

Thus the project shifted to creating a typeface that would prioritize legibility for the community the Braille Institute serves.

[1] The next year, it was shortlisted for a graphic design award by Dezeen,[9] losing to a series of heat-reactive stamps that illustrate climate change.

On the top line, the characters "B8 1Iil". On the bottom line, the same characters, very blurred but still readable to most people.
The font's normal appearance above, and a blur effect simulating how the same letters might appear to someone with a low-vision condition below