Myopia, or short-sightedness, is a visual alteration caused by the displacement of the point of focus, causing images to lose their sharpness when viewed from afar. In these cases, the images form in front of the retina.

The two main reasons for short-sightedness are that the diameter of the eye is too wide, or that the refractive power of the lens or cornea is too strong. In most people, short-sightedness is a genetically-inherited trait that is first noticed in childhood or adolescence.

Myopia can currently be correct with glasses or contact lenses, laser correction, or intraocular surgery. This provides different treatment modalities, for different types of patients and different types of refractive errors. However, for most people, the method that provides greater satisfaction, with more comfort and more visual freedom, is laser correction surgery.