To do this, ask the patient to cover one eye, hold the card about 14 inches away from his eyes, and read aloud the smallest print possible.

• 要做到这一点，要求患者遮住一只眼睛，拿着一张远离他的眼睛约14英寸的卡片，并让他朗读字体尽可能小的印刷品.