Blood Based Eyedrops From Different Sources in the Treatment of Severe Keratopathy - A Randomized Clinical Trial

The rationale for the use of eye drops prepared from the blood as a source is mainly based on their content in growth factors (Growth factors, GF), which play an important role in regulation of many processes involved in normal healing of damaged corneal epithelium . The most used product so far is the eye drop prepared from serum (Autologous Serum, AS) or from platelet-rich plasma (Plasma Rich Platelet, PRP) of peripheral blood taken from the patients themselves. More recently, treatments were introduced by homologous sources that undoubtedly offer advantages as compared to autologous sources. In particular the homologous sources show:

• not invasiveness to the patient, who could in time not like the repeated withdrawals

• applicability even in patients with underlying systemic conditions. They may contain in their blood, among others, higher levels of pro-inflammatory factors, with the consequence of poor and inappropriate final product to be prepared and delivered to the eye

• reliability, since the homologous products can be prepared, controlled, also validated under the microbiological profile and standardized advance, then kept frozen until the dispensation

• conceptually unlimited availability of the product to be dispensed

• versatility of therapeutic indications, based on different GF levels which are estimated in advance

The purpose of this study is to evaluate the effect of two products derived from two different blood sources (cord blood collected at birth from placenta umbilical veins and adult subject donor peripheral blood) in the treatment of severe keratopathies.