Myopia and hyperopia are both refractive errors, and these two disorders are two completely opposite refractive states. Myopia is a condition in which the refractive power of the eye exceeds the normal range, which is why it causes a loss of vision. If we compare the eye to a camera, under normal circumstances, the image formed by parallel light from the outside world will fall on the surface of the retina, which is called orthokeratology, and the eye can see a clear image. If the refractive power of the eye increases and the image formed falls in front of the retina, the condition is called myopia. Conversely, if the image formed falls behind the retina, the condition is called hyperopia and is a very common disorder of the eye. For both conditions, frame glasses and corneal contact lenses are currently used to correct vision. In the case of myopia in adults, surgical correction is also an option.