How does the technique of averted vision improve the visibility of faint astronomical objects?
Answer
It directs light onto the more sensitive outer parts of the retina.
Averted vision is a technique where an observer looks slightly to the side of an object rather than directly at it. This works because the center of the retina, known as the fovea, is packed with cone cells that are great for color and detail but poor at seeing in low light. The outer parts of the retina contain a much higher density of rod cells, which are far more sensitive to faint inputs. By shifting the gaze, the observer moves the image of the dim target onto this region of high rod density, often causing a previously invisible faint smudge to suddenly appear or become much clearer.
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