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The fundamental symptom of myopia is blurred vision for distant objects (approximately more than 20 feet). Myopia is an alteration that occurs in those who have large diameter eyeballs, or corneas with excessive curvature. The cause of myopia is not exactly known, although genetic factors are one of the main causes. Myopia usually manifests itself in childhood, during the schooling stage, usually progresses during growth and tends to stabilize around the age of 20.
Its main characteristic is blurred vision for close objects (approximately less than 6 meters). It is an alteration that occurs in those with small diameter eyeballs. Hyperopia manifests itself during childhood but unlike myopia it does not progress during growth. It is also genetically determined, and often causes headaches, mainly at the end of the day, due to constant effort to accommodate vision.
The main symptom of astigmatism is blurry vision of vertical, horizontal or diagonal images. It consists of a visual alteration caused by an irregular curvature of the cornea, which makes the image reach the retina out of focus. Astigmatism can appear either from birth, or develop throughout the life of the affected person.