However, myopia may also develop in adults due to visual stress or health conditions such as diabetes. Because the eye continues to grow during childhood, it typically progresses until about age 20. Generally, myopia first occurs in school-age children.
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People with myopia can have difficulty clearly seeing a movie or TV screen, a whiteboard in school or while driving. Symptoms of myopia may also be a sign of variations in blood sugar levels in people with diabetes or maybe an early indication of a developing cataract.However, constant visual stress may lead to a permanent reduction in distance vision over time. Clear distance vision usually returns after resting the eyes. After long periods of near work, their eyes are unable to refocus to see clearly in the distance. Their blurred distance vision is caused by overuse of the eyes' focusing mechanism. People who do an excessive amount of near-vision work may experience a false or "pseudo" myopia.Or the increased pupil size during dark conditions allows more peripheral, unfocused light rays to enter the eye. With "night myopia," low light makes it difficult for the eyes to focus properly. Some people may experience blurred distance vision only at night.Myopia may also occur due to environmental factors or other health problems:
Individuals who spend considerable time reading, working at a computer, or doing other intense close visual work may be more likely to develop myopia.
Even though the tendency to develop myopia may be inherited, its actual development may be affected by how a person uses his or her eyes. If one or both parents are nearsighted, there is an increased chance their children will be nearsighted. While the exact cause of myopia is unknown, there is significant evidence that many people inherit myopia, or at least the tendency to develop myopia. As a result, the light entering the eye isn't focused correctly, and distant objects look blurred. Myopia occurs if the eyeball is too long or the cornea (the clear front cover of the eye) is too curved.
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