What is power of accommodation?

The term "power of accommodation" typically refers to the ability of the human eye to adjust its focus in order to see objects clearly at different distances. This adjustment is made possible by changes in the shape of the eye's crystalline lens.

When you look at objects at varying distances, the ciliary muscles surrounding the lens contract or relax, causing changes in the curvature of the lens. This change in curvature adjusts the focal length of the lens, allowing the eye to focus on objects at different distances.

The power of accommodation is most commonly associated with near vision. When you shift your gaze from a distant object to a close one, the eye accommodates by increasing the curvature of the lens, enabling you to see the nearby object clearly. The ability to accommodate tends to decrease with age, leading to a condition known as presbyopia, where individuals may experience difficulty focusing on close objects.

The measurement of the power of accommodation is often expressed in diopters, which represent the strength of the lens needed to focus on a specific distance. Optometrists may use various tests to assess an individual's power of accommodation during an eye examination.