Corrective contact lenses are associated with Orthokeratology that is the creation of contact lenses that are gas absorbent and reshape the cornea with the aim of avoiding refractive errors like astigmatism, hyperopia, and myopia. For people who favor not wearing contact lenses and eyeglasses, or get refractive surgery orthokeratology can be a suitable alternative. Orthokeratology is frequently used for people who have -6.00 diopters of myopia.
Reshaping of glass lenses was discovered in 1940s by doctors. With the aim of reducing myopia by making the use of contact lenses, orthokeratology involves the assistance of Nolan, Fontana, Jessen, Gates, Freeman and Kerns. "Orthofocus" which is said to be the first orthokeratology design was made form Poly methyl methacrylate (PMMA) material was created by George Jessen in 1960s. Early designs as such provided results that were uncertain that created a belief that orthokeratology was not associated with just science but also art. The computerized corneal topography was accessible in 1990s; it then became attainable to make designs that gave out results repetitively by using non-obtrusive imaging process by precisely mapping the cornea surface. Furthermore, the introduction of new materials for rigid gas absorbent lenses that render high levels of oxygen absorbing assisted orthokeratology to become a process that was overnight instead of it being used for daytime.
Reports conferred at the Global Orthokeratology Symposium and British Contact Lens Association in the year of 2006 and 2007 claimed the attainability of orthokeratology decreasing or shunning myopia. Currently, results from Stabilizing Myopia by Accelerated Reshaping Technique (SMART) shows an extensively remarkable difference in children who wear orthokeratology lenses.
A substantial amount of adaption is observes by the cornea within few hours followed by days, even though complete adaption requires 2-3 weeks. In certain people, the vision may be troubled, such as ghosting or double vision in the initial period. Nonetheless, the trials of Food and Drug Administration confirm significant success rates once the adaptation is complete. The corrective effect is said to be steady but it is not permanent. The orthokeratology lenses are advised to be worn regularly to correct, conserve and manage the reshaping of the cornea. Commonly, they are worn for a certain part of the day; however few people may only use it at night.
Few adverse effects may include dry eyes, low sensitivity which is also termed corneal hypoesthesia, various eye allergies including lens solution allergy, infection or inflammation in the beginning part of the cornea, damage or deformity or disease that affects the cornea, eyelid or affecting the lens.