This keratoconus therapy is the result of a long and an extensive research and developmental process which was especially aimed at keratoconus treatment. Frequently, this technology is able to not only replace contact lenses, but also cornea transplants in most cases. It combines visual rehabilitation with a stop of the progression of the disease in a short and only minimally-invasive treatment.
As explained in the preceding section “What is keratoconus”, the shape of the cornea of eyes suffering from keratoconus is highly irregular. Thus, they arriving rays of light cannot be focused in one single focal point. Consequently, the eye fails to depict a precise image. The situation of an untreated keratoconus is illustrated in image 1 on the right. The situation after the implantation of the MyoRing is depicted on the right in image 2. The MyoRing is represented by blue dots in the cross-section. Based on the implantation of the MyoRing (blue) into the cornea, its regular shape in coined onto the cornea along its circumference; resembling the way the even surface of a drum is created. Thus, the cornea regains a rather regular structure. Consequently, it is possible to concentrate the arriving rays of light in one focal point again (green) which generates an enhanced depiction of objects inside the eye. A more precise image is created which, mostly, leads to a significantly improved visual acuity. An overview of the mode of action of this therapy can also be accessed by following the discussion of one such case by clicking the image below.
The therapy of keratoconus via CISIS and MyoRing is a minimally-invasive approach. Especially trained ophthalmologists insert a complete-ring, a MyoRing, which has very special properties, under the corneal surface between two corneal layers at a depth of 0.3 mm. In keratoconus therapy, the MyoRing improves the irregular corneal geometry towards a more regular surface by coining the corneal surface with its even structure. This leads to a significant improvement of visual acuity in keratoconus therapy. The positioning inside a cornea, between two corneal layers, together with the fact that, in contrast to ring segments, the MyoRing does not possess margins of any kind, leads to a rather high predictability of results and a extremely low rate of complications. Moreover, also in contrast to ring segments, it can be adjusted according to the actual postoperative axis which also accounts for significantly better results. All studies and biomechanical calculations available at present allow for the conclusion that, because of its complete shape, the MyoRing is able to stop the progression of keratoconus. CISIS / MyoRing is effective concerning mild as well as advanced cases of keratoconus, as long as the cornea measures at least 350µm; if the cornea measures less than 350µm, the only remaining option is a cornea transplant. However, this technology can also be applied if a cornea transplant preceded CISIS, assuming that the cornea transplant was not successful.