How Your Eye Works
Learn how the eye works
For you to see clearly, light rays have to be totally centered on the retina at the back of the eye. The shafts of light that emerge from an image pass through the clear cornea (covering of the eye) and then are bent as the travel through the eye’s inherent lens, that maneuvers the fine tuning of the focussing.
The optical image is formed by the light sensitive retina changing the light energy in to electical pulsations, which then walk along nerves to the region at the back of the brain that processes vision. This occipital part of the cerebral cortex tells us what we are seeing
Short-sightedness (myopia)
With short sighted or myopic people, the eye socket is too long, compared with the centering strength of the cornea and lens unit. Therefore the rays of light that come from the distant object converge in front of the retina as the corneal/lens focussing unit is too powerful.
This means that achieving a clear image of an object in the distance becomes increasingly challenging. Focussing on objects near by is OK. Thus kids may not learn as well as they can’t read what is written on the white board very easily.
In general, children and teenagers are the most commonly affected group of patients. You may find that the whole family have to wear glasses as there is a genetic tendency. However, these parents are usually well aware of the tell tale signs and So tend to bring their children to the aid of opticians relatively quickly.
Spectacles are required to correct the focusing by creating another element to the cornea/lens unit, which distorts the visual image to allow it to focus on the retina more readily. It can be quite expensive to buy spectacles all the time. However, it is possible to buy your spectacles online now. Myopia can also be handled by wearing contact lenses or even undergoing laser surgery to correct the defective visual unit
