explain the process of accommodation in the human eye. thanks :)
That is a subject in physiological optics or "ocular physiology", in which I am not an expert. A common example is the eyes' getting adapted to the dark (and more sensitive) after being in darkness for about a half hour.
See
http://en.wikipedia.org/wiki/Adaptation_(eye)
for an explanation
THANK YOU! :)
Certainly! The process of accommodation in the human eye refers to the ability of the eye to adjust its focus to view objects at different distances. This adjustment is made possible by changes in the shape of the lens within the eye.
Here's a step-by-step explanation of how accommodation occurs in the human eye:
1. When you look at an object far away, the ciliary muscles (tiny muscles surrounding the lens) are relaxed. This causes the suspensory ligaments (attachments between the ciliary muscles and the lens) to be taut.
2. Due to the tautness of the suspensory ligaments, the lens becomes thin and flattened. This shape allows the eye to focus on distant objects because light rays from these objects are already nearly parallel when they enter the eye.
3. Now, if you shift your focus to a closer object, the ciliary muscles contract. This contraction releases tension on the suspensory ligaments.
4. As the suspensory ligaments loosen, the elastic lens becomes more rounded and thicker. This change in shape increases the refractive power of the lens, allowing the eye to focus on near objects.
5. The lens changes its shape by becoming more or less convex using a process called "accommodation."
6. The process of accommodation involves the ciliary muscles, lens shape adjustments, and changes in the refractive power of the lens to ensure clear vision at different distances.
It's important to note that the process of accommodation is controlled by a reflex action within the eye, known as the accommodation reflex. This reflex is triggered by the brain, which senses the change in distance of the object being viewed.
I hope this explanation helps you understand the process of accommodation in the human eye!