An important factor to consider a eyepiece is eye relief. This is the distance between the viewer’s eyeball and the eye lens of the eyepiece.
The eye-relief distance is fixed by the eyepiece design and is normally rather exact. A person who wear glasses may have problem to get the full field of view as he cannot reach the correct eye relief point. If his eyes are outside the correct eye relief distance, the field of view is reduced and the reduction depends on the individual and the design of the eyepiece.
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