Examination of visual acuity

What is visual acuity?

Visual acuity is a quantitative measure of visual function and the eye's ability to distinguish fine detail by clearly distinguishing two points separated by an angle of one arcminute in focus at a certain distance.

How is visual acuity measured?

Visual acuity is most often measured by reading signs on tables with black symbols on a white background (optotypes) at a standard distance from the patient, first in the right eye, then in the left eye. The standard definition of normal visual acuity is expressed as 1.0 or 20/20 or 6/6. Visual acuity refers to the best possible visual function with or without correction by glasses or contact lenses. Visual acuity weaker than normal is called low vision or amblyopia. A prerequisite for good central visual acuity is the focus of the image in the center of the macula, along with orderly nerve pathways to the visual centers in the brain.

If you have noticed changes in your vision, react promptly and book an appointment for an ophthalmological examination.