The eye is an amazing piece of optical equipment and the extent to which it has changed over many millennia to ensure that different species of animals have the ability to see proportional to their needs is quite incredible. The different vision very varied and eyes have adapted over time to ensure that they provide their owner with the appropriate sight for their environment.
In simple terms, an eye detects light and changes it in such a way that it means something to the being whose eye it is. So how does the human eye in fact work? As you would expect, our eyes are a little more complicated than the basic eye. The light reaches the front of the eye, which then uses a diaphragm to amend how intense the light is and points it at a lens to make an image. The image is then changed into electrical signals and sent to the brain through the optic nerve, and then the brain can determine what to do with what it has collected about what the eye is seeing.
So, instantly, the human eye will register what shapes are in front of it and what colours the shapes are, and the whole method of assessing the information so that the brain understands how to react takes so very little time we don’t even notice that there is such a process occurring.
Vision Defects & Eye Complaints
It is obvious that it makes sense to look after your eyes as best you can, and to remember that things like too much light from the sun or spending too much time in front of a computer screen without allowing your eyes a rest can cause a negative effect on them. But, like the rest of the human body, the eyes themselves can be, or can become, defective. Some vision issues might be genetic defects inherited from your parents. Some are caused by or compounded by environmental factors. And some slowly develop over the years as the human body becomes older. After all, the impact of wear and tear applies just as equally to parts of the body such as the eyes and ears as it does to the back and knees.
The positive message here is that a lot of eye complaints are less difficult to treat than a damaged spine or arthritic knee joints. A large number of people wear corrective lenses if they are diagnosed with short or long sightedness – both of which can also be improved using Laser eye surgery. These complaints, plus astigmatism, are caused by the front of the eye (the cornea) being shaped incorrectly so that the light which connects with it becomes distorted and once the image is converted and passed on to the brain, the image is out of focus. As the cornea is an accessible part of the eye it is simple to use Laser eye treatment to amend its shape so that it works more efficiently.
Other eye problems, such as cataracts and presbyopia generally develop later in life. With a cataract, the eye lens begins to get cloudy so that seeing becomes difficult. Presbyopia is a condition where the lens doesn’t focus as well as it should and things which are close up will be out of focus.
Currently, the main solution for a cataract is to take away the cloudy lens completely and replace it with an artificial one. This is a very simple procedure with a very good success rate. Presbyopia, on the other hand, is usually treated with corrective glasses. However, Laser eye surgery processes are in use that can help the sufferer, depending on other health factors connected to the eyes.
So it is reassuring to be aware that, unlike a lot of parts of the body, the eyes are a comparatively simple thing to diagnose and treat to ensure that we can still take part in our daily activities and be capable of seeing what we are doing. And the variety of treatments available, such as simple reading glasses, contact lenses, surgery and Laser eye treatments, mean that very often there is even a choice of actions to solve your vision problems.
Originally posted 2016-11-01 06:03:07.