Aiming:
When aiming, the rear sight will never be well defined or clear because it is positioned too close to the eye and the eye cannot focus on objects closer than 15cm.
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The foresight is about 100cm away from the eye and the target is 25 yards away (depending on the length of the range) and both of these can easily be independently focused on. What the eye cannot do is focus on both the foresight and the target at the same time.
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The shooter should focus on the foresight instead of the target. In this case the target should appear as a slightly blurred spot and the eye will automatically try to make the shooter line up the target and the foresight. If the eye focuses on the target the foresight becomes blurry and it is much harder to align the target and the sights, thus making it harder to shoot accurately.
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For more information go to: http://www.smallborerifle.co.uk/aiming.php
