OrthoK/Control Corneal Molding

What is Control Corneal Molding?


Control corneal molding is a non-surgical way of correcting your nearsightedness and astigmatism. During the procedure, a series of therapeutic gas permeable lenses are applied to the cornea while you are sleeping. The therapeutic lens gently reshapes the central cornea overnight, and as a result, when you remove the cornea, your vision will be restored to 20/20.

How does the corneal reshaping lens work?

One of the common disorder of human eyes is nearsightedness (myopia). In myopic eyes, light rays are refracted too much. As a result, the light rays converge to a point in front of the retina. Patients suffering from myopia will see blurred images at a distance. In order for one to see images clearly again, one can either shorten the eyeball or change the light bending ability of one’s eyes so that light rays can be focused at the retina again. The human cornea determine 70% of how light rays bend. Therefore, if we can flattened the cornea and make the light rays bend to a point further back. Myopic eyes will then focus properly. The principle of corneal reshaping lens does exactly like what we described, it gently reshapes (flatten) the central corneal epithelium and alters the bending of light rays. As a result, light rays no longer focus in front of the retina, instead, it focus on the cornea again. Because the corneal reshaping lenses only the epithelium of the cornea, it does not alter the physiology nor the structural integrity of the cornea. Therefore, the vision improvement last for 12 to 14 hours only. If you did not wear the lenses to retain the shape, vision become blur again.


How safe are the lenses for you to wear them overnight?

One of the common complication from using the contact lenses overnight is corneal edema (swelling of cornea due to water accumulated between layers of cornea structure). Corneal edema is caused by a lack of oxygen supply to the corneal tissue as a result of wearing contact lenses. It can occur in soft lenses wearers as well as gas permeable lenses wearer. Thanks to the advancement of polymer technology, modern contact lenses material has a much higher oxygen permeability than before. Some of these material are five times more oxygen permeable than older material, making them an ideal material to use as a overnight wear material. Clinical trials indicated that these contact lenses show no corneal edema or physiological compromise after overnight wear. All Corneal Molding Lenses are made of FDA approved polymer for overnight wear.

Control Corneal Molding increase the risk of ocular infection?

Just like any contact lenses, Control Corneal Molding can cause eye infection if they are not handled properly. It is important for wearers to know that these devices need to be cleaned, and disinfected everyday to ensure a safe and healthy usage. As with all contact lens wear, infections can be avoided through proper hygiene and proper lens wear along with careful monitoring by Dr. Pang. Clinical findings indicated that the incident of ocular infection from using the Corneal Molding Lens is similar to regular contact lenses.
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Will Control Corneal Molding cause corneal abrasion?

The Control Corneal Molding lenses are custom designed to fit on each cornea differently. First the profile of the cornea is captured with a topographer. Essential data points are put into a sophisticate software to create a virtual model of the cornea. Using the digital model, Dr.Pang will design a lens which will place a gentle pressure on the center of the cornea. Next, the design is transmitted to a digital lathe which will generate lenses exactly as it is designed. The Control Corneal Molding lenses are actually sitting on a thin layer of tear. It does not have a direct contact on the corneal tissue as one would think. The gentle pressure is applied on the cornea through the tear film. There is no physical contact between the lens and the cornea. As a result, it is not possible to have any abrasion from using the Control Corneal Molding lenses