The power of accommodation of the eye is the ability of the eye lens to focus near and far objects clearly on the retina by adjusting its focal length. This means that the eye can adjust the shape of its lens to change the focal length and focus on objects at different distances. The power of accommodation is limited, which means that the focal length of the eye lens cannot be reduced beyond a certain minimum limit. The standard power of accommodation for normal eyesight is measured in diopters, which is a unit of refractive power and is equal to the reciprocal of the focal length in meters. For a person with normal eyesight, the power of accommodation is around 4 diopters. The process of accommodation is carried out by certain muscles called ciliary muscles, which function to change the focal length of the eyes so that the image is clearly formed on the retina.