Talk about ok mirror

Your question is, "Is De McGregor really effective?" . I checked Madiger's website, and there are two products, 1, orthokeratology mirror; 2. Corneal contact lens. I only talk about the principle, advantages and disadvantages.

Orthokeratology lens (OK lens for short) is a kind of permeable and breathable rigid contact lens, which can be divided into daily wear type and night wear type, and Madiger's is night wear type. Wearing OK glasses on the cornea can flatten the central area of the cornea and reduce the refractive power of the cornea, thus improving vision. This is the same as laser surgery, which is to reduce the refractive power of cornea to see clearly, but the method of reducing corneal diopter is different. OK glasses adopt compression method, and laser surgery uses laser to remove a layer of cornea. The advantage of OK mirror is that it can improve vision quickly and effectively. The disadvantage is that the cornea is elastic. After being flattened, it will return to its original state after stopping wearing, and its vision will decrease. You can ask McGregor how to prevent it from bouncing back to its original state, but no matter how he explains it, he can't get around the problem of corneal elasticity. In addition, it may also cause complications, such as corneal injury, decreased corneal perception, corneal ulcer and so on.

Corneal contact lenses are also worn on the cornea, which can be seen clearly through the degree of the lens. The principle is the same as that of frame glasses, which uses concave lenses to shorten the focal length and let the focus fall on the retina. Contact lenses also have the above complications.