Autologous blood serum is used for severe dry eyes [ 1 Poon A.C. Geerling G. Dart J.K.G. Fraenkel G.E. Daniels J.T. Autologous serum eyedrops for dry eyes and epithelial defects: clinical and in vitro toxicity studies. Br J Ophthalmol. 2001; 85: 1188-1197 Crossref PubMed Scopus (247) Google Scholar , 2 Noble B.A. Loh R.S.K. Maclennan S. Pesudovs K. Reynolds A. Bridges L.R. et al. Comparison of autologous serum eye drops with conventional therapy in a randomised controlled crossover trial for ocular surface disease. Br J Ophthalmol. 2004; 88: 647-652 Crossref PubMed Scopus (217) Google Scholar ] and chronic corneal ulcers [ [3] Tsubota K. Goto E. Shimmura S. Shimazaki J. Treatment of persistent corneal epithelial defects by autologous serum application. Ophthalmology. 1999; 106: 1984-1989 Abstract Full Text Full Text PDF PubMed Scopus (306) Google Scholar ]. The serum has to be aliquoted, stored and the process has to be repeated regularly. It is an expensive and time consuming process. This treatment is not easily available and when it is available there is often a significant delay. During this delay the chronic ulcers can be sight threatening and may require surgical tarsorrhapy.