“Qu” means turning or curving. “Chai” means irregular or uneven. The meridian turns abruptly towards the lateral side of the head from Meichong (BL3), making a crooked line before arriving at the point. Hence the name Quchai (Irregular Turning).
0.5 cun within the anterior hairline and 1.5 cun lateral to the anterior posterior midline of the head.
Blurring of vision.