Both are leading causes of preventable blindness, and both show up on a picture of the retina years before sight is lost. The cameras that take that picture are expensive, stay in eye clinics and need a trained person to run them. Most people at risk are never photographed.
Clinic retina camera$15k–$30kFixed in the clinic. Trained operator. Often dilating drops.
DarkRoom headset< $100Target cost at volume. Wear it in a pharmacy, a clinic or a village.
Who runs itNo oneTarget lights and one focus knob replace the operator's hand skill.