Fig. 3.

Simulated vision chart seen through the refractive statuses of − 1.50 D WTR and ATR simple myopic astigmatism (COAS vision simulation program). Without the slit, both groups could see best at a 1.3 m distance (at which the circle of least confusion coincides on the retina). With the slit, the distance at which the vertical focal lines lie on the retina showed better vision than before (6 m of the − 1.50 D WTR astigmatism and 67 cm of the − 1.50 D ATR astigmatism)