For Averted Vision we have a term and definition in Telescope.

When you look squarely at something, you are using a part of the retina of your eye that is not as sensitive to low light levels as the parts that are off to the side. Thus to see People sometimes ask which way to avert -- that is, which way away from the center of the field to move their gaze. Try several'>faint objects, don't look straight at them. Center them in the field of view of your telescope, but fix your stare part way out to the edge of the field.
People sometimes ask which way to avert -- that is, which way away from the center of the field to move their gaze. Try several.
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