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Fig. 5 | BMC Ophthalmology

Fig. 5

From: Eyelid squinting improves near vision in against-the-rule and distance vision in with-the-rule astigmatism in pseudophakic eyes: an eye model experimental study

Fig. 5

Schematic illustration of the effects of the eyelid on astigmatic focal lines. As the eyelid fissure size becomes smaller than the diameter of the entrance pupil, a slit-like effect occurs and eventually shortens the vertical focal lines. In simple ATR astigmatism, the focus (circle of least confusion) moves to the nearer plane; in WTR astigmatism, the focus moves to the farther plane

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