Maybe but it was on the tip of a finger in a moving image changing size as the person squeezed their finger, also something that I never previously considered,

Maybe but it was on the tip of a finger in a moving image changing size as the person squeezed their finger, also something that I never previously considered, blind people have tend to have no/little artificial light on when alone, luckily the app allows the person providing the assistance turn on the flash on the other persons phone.