What Is Short Sightedness?
Recognise how the eye functions
Hence that you can see clearly, light rays have to be 100% convergent on the retina at the back of the eye. The shafts of light that reflect from an image pass through the transparent cornea (covering of the eye) and then are bent as the travel through the eye’s inner lens, that operates the fine tuning of the focussing.
The visual image is imprinted by the light sensitive retina changing the light energy into electical neural impulses, which then communicate 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 near sighted or myopic people, the eye socket is too long, in relation to the focusing strength of the cornea and lens unit. Thus 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. And So children might not learn as well as they can not 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 Therefore tend to bring their kids to the attention of opticians relatively quickly.
Spectacles are needed to set right the focussing 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 anomalous visual unit
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