Ortho-Keratology lenses are specialized custom-made hard contact lenses that are worn overnight that gently reshape the front curvature of the eye to temporarily reduce the amount of myopia (nearsightedness) during the day. It can take up to 1-2 weeks to get the eye to get to the shape it needs to be in order to see clearly throughout the whole day without any correction. The ortho-K lenses that are worn overnight will mold the cornea in a specific shape such that then when light enters the eye it focuses properly on the central and peripheral retina allowing the patient to not only see clearly but this helps to slow down the progression of myopia. According to the peripheral defocus theory, the whole issue with progressing myopia is that light does not land properly at the peripheral retina, resulting in a biochemical feedback loop to cause the eyeball to elongate and increase in myopia. But, with this corneal reshaping therapy this ensures that light will then land properly at the peripheral retina, thereby reducing the signal for the eyeball to elongate and essentially slowing down the progression of myopia.