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There are several types of [url=http://www.informacionopticas.com/orto-k-precio/]Orto-k[/url] procedure based on the type of use , &quot; &Atilde;&Acirc;&raquo;
Daytime orthokeratology in which lenses are used for part of the day or the hour . It's the type of procedure historically oldest and was first used in the 60s of XX century ( 2). After conducting several studies mean reduction rates of around 1.00 diopter were reported in about 18 months of treatment ( 3-15 ) .
The introduction of contact lenses reverse geometry in EE . UU . in 1993 there was a drastic change and revived interest in Orthokeratology ( 16). With these lenses in daily use it was possible to treat up to -2.75 diopters over a period of time of 3 months ( 17). A technique that is known as Accelerated Orthokeratology given that was faster and possibly more effective than previous techniques ( 18).
From the mid -90s started to use night Orthokeratology . In this treatment contact lenses reverse geometry (molds ) are used at night while the patient is sleeping. Today, it is the most used and recommended by professional art.
Mechanism of Action [edit &Atilde;&Acirc;&middot; edit code ]

Effect of the lens on the eye
Wikipedia is not a medical doctor's office notice
Contact lenses used in Orthokeratology produce a temporary reduction of myopia by changing the shape of the cornea . The cornea is elastic in nature. The lens rests on a thin layer of the cornea teardrop shapes . 
&lt;A HREF=&quot;http://www.informacionopticas.com/orto-k-precio/&quot;&gt; Orto-k&lt;/A&gt;
Permeable contact lenses are designed to normal looking gas that are as parallel as possible to the profile of the cornea to cause no effect or ortoqueratol&Atilde;&Acirc;&sup3;gico molding . The Ortho- K lenses are designed with the purpose of producing a molding effect on the original shape of the cornea ( rheology ) . The pressure occurs when the lens is less curved than the cornea , so that most of the weight of the lens on the cornea center rests . When the cornea changes its curvature, reduces its amount of diopter and corneal flattening is sufficient to compensate for myopia. Once the lens is removed, the cornea has a tendency to maintain the new shape for many hours. Allowing good vision without having to wear anything during the hours the patient is awake.
Being the ratio of the refractive change possible and the diameter of the flattened area confirmed by applying the formula Munnerlyn and similar to that used in the excimer laser refractive surgery.