<prompt> Visual acuity of 660 is classified as?Low visionNormal visionBlindnessVisual morbidity  <response>: Low vision REF: khurana 4h ed p. 444 Category grade Level Normal vision 0 66 to 618 Low vision 1 Less than 618 to 660 Low vision 2 Less than 660 to 360 Blindness 3 Less than 360 to 160 Blindness 4 Less than 160 to light perception Blindness 5 No light perception 