Improving Visual Acuity

By Lynn Marsh, RDH, EdD, and Margarita Rivera, RDH, MSDH

Visual acuity is defined as the clarity or sharpness of vision measured at a distance of 20 feet.¹ Typically, the clarity of vision is measured by the ability to distinguish different sized letters or shapes at a fixed distance, usually with a Snellen chart (Figure 1).² Normal visual acuity is rated as 20/20 vision.^1,2 Visual impairment is defined as acuity less than 20/60, and blindness as visual acuity worse than 20/400.^3,4

* References can be found in the original article via the link below.
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