American Board of Opticianry (ABO) Practice Test

What does "20:20" represent in the realm of opticianry?

1. Converge

2. The point where lines that bisect the horizontal and vertical measurements of the lens in the boxing system intersect

3. On the temporal side of the lens

4. 20 feet

The correct answer is: 20 feet

In opticianry, "20/20" vision is a standard measure of visual acuity and refers to the ability to see details at a distance of 20 feet that a person with normal vision can see at that same distance. This indicates that if a person has 20/20 vision, they can spot an object or detail from 20 feet away just as someone with ideal vision would do. This measurement is critical in assessing an individual's sight and serves as a baseline for what is considered normal vision. This is why the correct response centers around the concept of distance, specifically the distance of 20 feet. Understanding this term is fundamental for professionals in the field of opticianry, as it helps them communicate the effectiveness of vision correction methods and the health of a patient's eyesight.