Accommodation Area

Accommodation Area

_The area of ​​accommodation, also known as the length of accommodation or the range of adaptation of the eyes to different distances from an object, is the ability of the eye to change its refractive power in order to focus on objects at different distances. Thanks to this ability, the eyes can take a clear image of various objects in accordance with changes in their focal length._

Definition Accommodation Accommodation is the ability of the eye, when the ciliary muscle is tense, to change the curvature of the cornea. It occurs due to the fact that the ciliary muscle stretches, increasing the resting tone of the ciliary muscle and slightly increasing its size. Pulling the ciliary muscle, located in the eye muscles, leads to a reflex contraction of the radial half of the ciliary body. This leads to a change in the position of the lens, as a result of which the focal length of the eye changes, that is, its ability to receive a clear image. In this case, the ciliary muscle relaxes and returns to its original shape.

Area of ​​Accommodation This measure of length is calculated as the distance between the points where the eye focuses at maximum accommodation (or _dystopia_) and the minimum accommodated focal length (i.e. *extopia*). This gives an idea of ​​how far away objects can be from the eye that it can focus on in a state of maximum accommodation. The eye at maximum accommodation is located approximately 8 mm from the point of the object in question, which is clearly perceived by the eye.

When the eye works close, more intense irritation of retinol receptors leads to short-term preparation of the accommodation apparatus - active accommodation occurs. The minimum accommodated focal length is equal to the focal length of the eye near, i.e., close distance differs from long distance in that the size of the eye on which it depends is smaller, therefore it is closer. How does it work? *Please note that all values ​​are measured in meters, not feet, so the appropriate multipliers must be entered: + Distance to object X=2m from correct location L = 1.13 m – distance at which a person is when his eye is located at a distance of ≈ 2.5 cm from eye level to obtain the maximum size of the iris. + Strobism of the hypermetropic eye is accommodation in the range from 8 to 21 meters. * By placing the iris at the site of dystopia, the eye is tuned to receive an image of the object beyond the strobe. But if the object is closer to the eye, the effect due to dystopia creates images in the correct focus. The closer the object is, the stronger