What specific visual technique helps an observer detect the faint glow of M101 peripherally?

Answer

Averted vision

The technique involves focusing on a nearby, slightly brighter star just to the side of the galaxy's position, allowing the faint light of M101 to drift into the rod cells concentrated in the peripheral retina.

What specific visual technique helps an observer detect the faint glow of M101 peripherally?
galaxyastronomyobservationPinwheel GalaxyBinoculars