Saturday, 26 November 2011


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Technically, long sighted people may also have difficulty seeing distance and near clearly especially if well above the age of forty! This is not a mistake, isn’t it a known fact that long sighted people can see distance clearly and have problems only with near?
For an object at distance to be seen clearly, the rays of light from that object must fall on the retina (the inner photographic coat of the eye). In a short sighted person, the rays fall short of the retina (anterior) and behind the retina (posterior) in a long sighted person. So in both cases the image of a far object is blurred
A long sighted person can see clearly through what is called accommodation. This is an active process causing an alteration in the shape of the neural lens inside the eye thereby making it possible for rays of light falling behind the retina to be focused on the retina. A long sighted person employing his accommodation will bring the rays of light which is behind the retina to focus on the retina and the object is then seen clearly. Now imagine the same process happening to the rays of light in front of the eye in a short-sighted person. The rays of light will move farther away in front of the retina and the vision becomes more blurred. So the short-sighted person learns that using his accommodation makes his vision worse and as a rule avoids using it. The long-sighted person benefits from it and uses it regularly.
Young people have tremendous amount of accommodation in reserve and they use it successfully for clarity of distance vision. Their reserve may also provide the additional effort needed for reading and other tasks at near.
Unfortunately, the more above forty years you are the lower your ability to accommodate and therefore distance vision tends to be blurred in the long-sighted patients well above the age of forty. But accommodation is not supposed to be for distant vision. It is meant for near work such as reading, sewing etc.
Therefore, the long-sighted person gets tire using his accommodation for distance when he shouldn’t. When he has to do close work such as reading, the muscles or accommodation are already tired and they relax off and on to take a rest leading to intermittent blurring of near vision. It is like you are running when you are supposed to sit down. When you are now suppose to be running, you are already tired and out!
The constant and the unconscious attempts by the long-sighted person to see clearly at distance and near result in eye strain and subsequent eye ache. This eye ache may be quiet intense and tends to occur towards the close of the day. Usually there are no visible signs in the eye. It is persistent and will not go away until appropriate glasses are prescribed. Since accommodation diminishes with age, it is therefore obvious that there is need for a change of glasses to take care of the increasing loss of accommodation which occurs with age.
Eye aches are majorly due to fatigue caused tiredness, concentrated gaze (at a computer or television screen) in the near or intermediate distance even in those without any need for glasses. Excessive intake of alcohol and drinks containing stimulants such as caffeine can tend to impairment of accommodation and eye ache.
Eye ache is best resolve by discontinuing whatever activity you are engaged in and resting your eyes for 5-10 minutes every hour, looking away into the distance at non specific point, or by closing the eye for 5 minutes every hour to rest them. Sleep, no matter how short is also useful. Basically part of your body is tired, do what you would do normally if you were feeling tired.
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