Optics

hypermetropia

Vision of a person who has the visual defect of hyperopia

We can say that our eye, or eyeball as it is also called, is an extremely sophisticated optical system and can also present some imperfections in its structure. Such imperfections can cause what we call vision defects. The most common vision defects we hear about are myopia, farsightedness, presbyopia and astigmatism. In this text we will focus on the study of hyperopia.

Our eye has two basic characteristics that some people who have visual defects do not have. The first one is that it is able to focus, on the retina, objects that are very distant, that is, at infinity, without accommodation of the lens. The second is that it is able to focus, also on the retina, objects located very close to the observer.

We can define the hyperopia visual defect as being a defect opposite to the myopia visual defect (does not allow clear vision of a distant object). Hyperopia is characterized by a flattening of the eye in the direction of the anteposterior axis or by a diminished convergence, in relation to the normal eye. In the case of hyperopia, the image is formed after the retina and this causes a lack of sharpness in the formation of close images.

For a hyperopic person to be able to see objects that are close to him clearly, it is necessary to increase the convergence of his eye. In order to increase the convergence of the eye, it is necessary for the person to use converging lenses or undergo surgery to modify the curvature of the cornea, making it more convergent.

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