Correction of keratoconus
Arrange a qualifying exam, correct your keratoconus and start enjoying your life defect free!
Keratoconus (conical cornea) is a disease of the cornea during which its shape is changed due to thinning of the stroma. Symptoms occurring in the cone of the cornea are diverse, ranging from a vision deterioration, itching, redness of the eyes, sensitivity to light, double vision and distortion of images. A characteristic symptom of keratoconus is poliopia monocular, also known as multiple vision. Often, symptoms are accompanied by rubbing the eyes. Keratoconus occurs most frequently bilaterally, with a variable degree of disease development. The disease is progressive. It is manifested through phases of deterioration, which are interrupted with variable periods of stability.
Keratoconus usually affects young individuals, and thus the number of patients suffering from keratoconus is growing every year. This condition typically presents during puberty, causing deterioration of visual acuity in patients with myopic or mixed astigmatism. The disease is usually diagnosed in individuals aged 18 – 20. However, in patients aged over 55, disease progression is typically halted. Due to potential cytotoxic effect of the UVA on endothelium of the cornea, the cross-linking treatment is not available to patients with a corneal thickness of less than 350 μm and also having altered Descemet membranes (microscopic cracks, a cell number less than 2000 /mm2).
Modern equipment helps to diagnose this disease at an early stage of its development and the cross-linking procedure allows to stop its progression using non-surgical methods.
The possibility of early detection and monitoring the progress of disease has considerably increased with a development of modern diagnostic equipment. Methods of surgical treatment of the cone have been developed as well, including intrastromal corneal ring segment (ICRS) implantation made of PMMA and deep anterior lamellar keratoplasty.
Cross-linking is a non-surgical method which stabilizes the progressive keratoconus and sometimes reduces the highlight of the cornea. The cross-linking method is based on induction of a formation of new chemical connections – “bridges” – between the corneal collagen molecules that increase its resistance. The procedure was developed by professor Seiler and is not very complicated – in the center of the cornea (near the 9.0 mm zone), the riboflavin, dissolved in 20% of dextranis, is administered in drops. Later, a cornea is irradiated with ultraviolet ray of 3 mW / cm2 and a wavelength of 365nm for 30 minutes.
Riboflavin is administered in a form of drops every 2 minutes during UV exposure, protecting the retina and intraocular lens against ultraviolet radiation. The riboflavin penetration into the anterior chamber is controlled with a slit lamp. The ultraviolet light facilitates formation of new connections between collagen molecules. The effect achieved is similar to the light exposure on dental fillings – corneal tissue becomes hard and resistant to changes.
Cross-linking method can be used together with the Intacs rings implantation, which creates not only the effect of stabilization of the cone, but also significantly improves visual acuity. After the irradiation of the cornea and the 3-months of follow-ups regarding its shape stabilization, PRK custom ablation treatment is performed – it is a targeted laser ablation of the cornea based on the keratotopographic image in order to give it more spherical surfaces, which ensures a complete removal of the refraction anomalies.
This procedure is used primarily for the removal of keratoconus. A laser runs along the cornea according to its mapping, which gives the possibility of complete elimination of the cone at its initial phase. By means of this special technology, developed by Voigt Medica, we also provide a removal of “plus” defects of the eyes (hyperopia), taking into account shifts of the optical center occurring in people with “plus” eye defects.
The results of clinical studies indicate a high effectiveness with a relatively small risk of possible complications using this method. Cross-linking treatment performed in pre-clinical stages of cone hinders changes in the cornea at the early, easy to correct optical level. What is more, in most cases significant improvement in the parameters of keranometry has been reported, which improves uncorrected visual acuity. Cross-linking is also indicated in case of corneal ectasia following the refractive surgery.
Patients of Voigt Medica Eye Clinic who do not want to pay once for the procedure are welcomed to spread the cost of surgical treatment from 3 to 12 interest-free installments!