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: looking at a smart phone) is associated with around a 30% higher risk of myopia and, when combined with excessive computer use, that risk rose to around 80%. In fact, high levels of screen time on smart devices (i.e. Individuals who spend considerable time reading, working at a computer, playing video games 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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