Tech in elder care is notoriously lacking, especially with regards to vision impairment.
(Anecdotally, my grandmother has trouble cooking because she cannot decipher the controls of her stove due to her lowered vision)
So any program that can cast displays (digital or an analog-to-digital conversion) to a bigger screen for vision impaired people in a transparent manner is definitely needed.
And yes, you could hack together a Linux box with a camera or screen sharing, you name it, but it should be very easy to set up, as elder care typically isn't very tech proficient.
Mastodon server of https://doma.dev.