The eye is a complex organ that serves as the core of our most treasured sense — sight. Learning about the structure of the eye (anatomy), how the eye works (physiology), and the ways that the eye can change over time are essential to understanding your vision.

Eye Function

The best way to understand function of the eye is to compare it to a camera. A camera creates images by focusing on an object and allowing specific amounts of light to pass through a hole to create a visual impression on film. The eye functions in much the same way.

When light enters the eye, it passes through the cornea (camera lens) where 2/3 of focus is achieved. The light then passes through the pupil where the iris (aperture) adjusts the amount of light that is allowed to enter. The remaining 1/3 of focus is then achieved when the light passes through the lens (camera lens).

The shape of the lens can adjust (either thinner or thicker) by tensing or relaxing the muscles of the eye. The focused light finally reaches the retina (film) where it is converted by the rods and cones into a signal that can travel to the brain (film development). Once the image reaches the brain, you have sight.

Eyes As We Age

As the human body ages, changes in vision can occur. One of the more common conditions associated with the aging process is presbyopia. Presbyopia occurs when the lens becomes less flexible and therefore loses its ability to focus on objects by changing its shape. This causes blurred vision when trying to focus on objects that are up close.

Presbyopia has been treated traditionally with reading glasses or bifocals. For anyone over age 50, reading glasses are inevitable. Until recently, people with presbyopia have not been able to correct their problem with surgery because the available procedures were not effective. Now, a revolutionary technology may help people with this condition reduce their dependence on reading glasses.

Information from MyClearVision.com