> the typical brightness of streetlamps outdoors in most cities, humans are using photopic rather than scotopic vision Becase they would be useless otherwise.

> the typical brightness of streetlamps outdoors in most cities, humans are using photopic rather than scotopic vision Becase they would be useless otherwise. Take a 650nm led and a 500nm led and try turning them down slowly. The 650nm one will just go off with very limited, if any, dark adaptation. You will be able to see the led glowing, but the room won't seem to be illuminated. With the 500nm light, there will be a wide range to which the eye can adapt easily. >The cause of the nearsightedness epidemic (e.g. in East Asia) is children not going outside in the sun during the day. The details of the lamps they use at night (indoors or outdoors) are irrelevant to that. The evidence for light chromaticity seems to be more convincing. It's supported by animal models and it provides a plausible mechanism. The light intensity on the other hand is suggested by nothing but weak correlation, which could be bacause children who spend more time outside are on average exposed to less yellow light. You can have a rising/setting sun in your peripheral vision without it feeling unpleasent, the lights are either way too bright, poorly constructed or there is something wrong with your eyes. (a cataract maybe?)