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Which type of ametropia occurs when an image is focused in front of the retina and is usually caused by the eye being too long?

  1. Hyperopia

  2. Myopia

  3. Presbyopia

  4. Astigmatism

The correct answer is: Myopia

Myopia is the correct answer because it is a type of ametropia, or refractive error, that occurs when the eye is too long and the light focuses in front of the retina. This can result in blurred distance vision. The other options are incorrect because they refer to different types of refractive errors that are caused by different factors. Hyperopia is the opposite of myopia, where the eye is too short and the light focuses behind the retina. Presbyopia is a vision condition that occurs naturally with age and results in difficulty seeing up close. Astigmatism is caused by an irregularly shaped cornea, resulting in distorted vision at all distances. Therefore, these options do not match the description of ametropia caused by an eye being too long.