Contact lens use is a major risk factor for sight-threatening ocular pathology, particularly microbial keratitis, which can lead to permanent vision loss or require corneal transplantation if not promptly treated. The pathogenesis involves disruption of corneal barrier function, increased susceptibility to infection by bacteria (notably Pseudomonas aeruginosa), fungi, and Acanthamoeba, and induction of chronic inflammation and metabolic impairment in the corneal epithelium. The high prevalence of poor lens hygiene and risky behaviors among wearers underscores the need for meticulous care and regular professional oversight to prevent these serious complications.A 43-year-old male with personality disorder as only as only medical history attends to a urgent demand consultation at a General Practitioner Centre in Barcelona. The reason for consultation is red and painful eye.  After brief history taking and ocular inspection, several severe and urgens pathologies are considered under the differential diagnosis (uveitis, foreign body, corneal erosion or ulcer, etc). The patient referred use of contact lenses but denied the use in the previous week.  Once the ocular exam was performed, contact lenses in both eyes were found. After fluoresceine tinction of the painful eye, superficial pitting and unique corneal ulcer was diagnosed. The patient was referred to Oftalmology Emergency Care Centre for treatment.Oftalmology is often an unknown and feared topic in General Practitioner consultation. Nevertheless, with some clear concepts and minimum clinical exploration and procedures, a strong presumption of diagnosis can be issued.A methodic history taking, physical examination and high level of suspicion, is critical in low-resources environments such as a General Practitioner consultation. Furthermore, when it comes to less known topics, a orderly way of working is critical…