The Braille Institute released an update to their Atkinson Hyperlegible font. My late grandmother approved of its shapes, so check it out if you want to maximize legibility of all letters and numbers in your life. (And when do you not want to be able to read what you type?)
My grandmother is 91 years old and, for about 2 years now, her sight degraded to almost-blindness. She barely sees milky shapes in her central field of vision. It’s supposedly better in the corners of her eyes, but I couldn’t get any reliable confirmation out of her regarding that. So using a telephone is a problem.