Ocular Surface Tumors As part of my fellowship training I expanded my experience in evaluating and treating various tumors that can appear on the surface of the eye including Ocular Surface Squamous Neoplasia, or OSSN. These tumors are similar to early skin cancers that can develop on the face, nose, scalp, and ears as people age. Diagnosis is based upon the clinical appearance in combination with an imaging technique called Ocular Coherence Tomography. Sometimes an excisional biopsy must be performed to reach a definitive diagnosis. The most important risk factor for the development of OSSN is exposure to UV light. Fortunately, these lesions are uncommon and carry a good prognosis if diagnosed early. The two main forms of treatment are surgical excision and topical chemotherapy. Depending on the size and appearance of the lesion, one treatment may be more effective than the other. In most cases, however, the two treatment options are both effective in treating the cancer, and a discussion with each patient helps better determine which therapy is best for them. While this can be a scary diagnosis for a patient to receive, prompt diagnosis and treatment often results in excellent outcomes.