The ocular surface is comprised of the cornea and its overlying tissue, the conjunctiva. The ocular surface is continuously exposed to the external environment and, therefore, to different microbial species. A resident ocular surface microbiota has been found in various studies. Although little is known so far, some elements of this microbiota and/or its metabolites could represent protective cofactosr in the pathogenesis of common ocular diseases.~On the other hand, the gut microbiota is known to influence host homeostasis in distal tissues, such as brain (gut-barin axis), lungs (gut-lungs axis) and skin (gut-skin axis). However, little is known about distal effects of the gut microbiota on the ocular surface.~In this study we sought to evaluate the efficacy and safety aspects of L.sakei as both ophtalmic probiotic lysate and oral live probiotic on Dry Eye Syndrome, using a factorial design, against placebo.
This study will evaluate efficacy and safety of systemic and ophthalmic probiotic from bacterial lysate of Lactobacillus sakei on microbiota, immunological and clinical outcomes of patients with Dry Eye Syndrome.