There are two eye ailments known, Myopia and Presbyopia. These are otherwise known as near-sightedness and far-sightedness.
Myopia is caused by the eyeballs elongating. This can be caused by looking at objects close up for long periods of time. Myopia becomes a problem due to eye strain, pressure or anxiety. Looking at materials close for long periods of time without a break can cause the eyes to strain.
Near-sightedness can also be contributed to mental strain and psychological issues. Myopia can be caused by anxiety or nervousness about the future. Subconsciously the person may be afraid of what lays ahead of them and are unable to look ahead to the future and as a result have a hard time being able to see objects in the distance.
Presbyopia is the ability to see things in the distant but not things close up. Far-sightedness usually starts affecting people in their 40s. This is when the lenses of the eye start to harden. This ailment is considered to be part of getting older and so we often just accept the problem and get glasses.
Presbyopia can also be be caused by psychological issues. People start to look too far to the future and refuse to look at things right in front of them. They allow their focus to be on things like retirement instead of looking at what needs to be attended to today such a fixing the leaking faucet.
Both these ailments can be avoided by allowing the eyes to move around naturally each day. If you are studying something up close for most of the day, spend an hour or so looking at things in the distance. If you are looking at things far away grab a book and read some pages.
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