Two of the most common visually ailments are Myopia and Presbyopia; otherwise known as near-and far-sightedness. Both are ailments effect vision and the distance that is seen when looking at objects. Both ailments can be cured on their own if allowed. Almost all eye ailments are caused from bad habits learned as children, and strain on the eyes.
Myopia is caused by the eyeballs elongating. This ailment is caused by habits which include only looking at objects close up for long periods of time. This starts out in school age children who are forced to learn things from books and other materials requiring close contact focus.
Myopia becomes a problem due to strain on the eyes, pressure, anxiety, or frustration. The pressure young children have to succeed is enormous. When information is boring, it is hard to actually learn. Looking at material for long periods of time without a break can cause the eyes to strain on close up information.
Near-sightedness can also be contributed to mental strain and psychological issue. Myopia can be part of an 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. In this case, they are comfortable where they are and feel safe in their close up world.
Presbyopia is the ability to see things in the distant but not things close up. Far-sightedness starts affecting people in their 40s. This is when the lenses start to harden. The muscles around the eye can still be train to force the eyes to contract even with harden lenses. This ailment is believed to be part of getting older, so we just accept the problem and get glasses. We allow our eyes to become lazy and learn to rely on artificial lenses to get us through each day.
Presbyopia can also be 'all in the mind'. 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 retirement instead of on fixing the leaking faucet today.
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.