Understanding Melanoma: Skin and Eye Cancer
Melanoma, a serious form of skin cancer, is commonly identified by new or changing moles, rough patches, and skin discoloration. While it typically manifests on the skin, it can also develop in the eyes. Eyelids, frequently exposed to UV radiation, are particularly susceptible. If left unaddressed, cancers in this area can spread to the inner eye and even the brain.
Ocular Melanoma: Beyond the Skin
Ocular melanoma is a distinct type of cancer that originates inside the eye. This category includes subtypes such as uveal and conjunctival melanoma. Both the skin and eyes contain melanocytes, the cells responsible for producing pigment, and mutations in these cells can lead to melanoma. While sun exposure is a common cause for skin melanoma, uveal and conjunctival melanomas are not primarily linked to UV light. Instead, individuals with lighter eye colors or pre-existing conditions like nearsightedness may face an increased risk.
While sun exposure is a common cause for skin melanoma, uveal and conjunctival melanomas are not primarily linked to UV light.
The Growing Concern and Importance of Eye Exams
Given the nationwide increase in melanoma and skin cancer, eye care professionals strongly recommend regular eye exams every one to two years to detect potential cancerous changes. People should actively monitor for subtle alterations such as blurred vision, spots, or irritation in or around the eye.
Dr. Jacqueline Bowen, an eye doctor and president of the American Optometric Association, stated that eye-related skin cancer can manifest in various ways, either originating in the eye or spreading from other body parts. Approximately 1 million U.S. adults live with melanoma, with around 212,000 new diagnoses projected annually. The disease has a mortality rate of about two per 100,000 people in the U.S., resulting in approximately 8,000 deaths per year. Melanoma rates have significantly risen over the past three decades, with a doubling of diagnoses from 1982 to 2011, and a 31.5% increase between 2011 and 2019.
Delving Deeper: Uveal and Conjunctival Melanomas
Uveal and conjunctival melanomas are two specific forms of ocular melanoma. In their early stages, they often present no symptoms. However, as they advance, patients may experience blurred vision, floaters, flashes, or changes in pupil shape. While the precise causes remain unclear, a higher risk is associated with lighter eye and skin colors; the role of UV light in these ocular forms is not definitively known. The Melanoma Research Foundation reports about 2,000 new cases of ocular melanoma annually.
Conjunctival melanoma, which affects the clear tissue over the eye, is rare, with about 130 cases yearly in the U.S. Symptoms include irritation, redness, or a feeling of a foreign object in the eye, potentially leading to vision loss or pupil size changes.
Uveal melanoma, the most common eye cancer, starts in the eye's middle layer (uvea) and is not believed to be influenced by UV light.
Dr. Bowen emphasized that serious eye cancers, especially uveal melanoma, frequently cause no pain or vision changes in early to mid-stages.
Uveal melanoma is considered life-threatening because the retina, an extension of the brain, provides a direct pathway for cancer to spread if undetected.
Annual comprehensive eye exams are therefore crucial, enabling doctors to identify small or early precancerous and cancerous lesions using specialized microscopes. Early detection significantly improves patient outcomes.
Treatment and The Power of Early Detection
While definitive cures for ocular melanoma are not yet established, treatments such as specialized laser therapy or plaque brachytherapy can effectively eliminate tumors. Patients who undergo successful treatment are then considered to have "no evidence of disease (NED)."
Dr. Bowen advised anyone noticing changes in their eyes or vision, particularly if symptoms persist or worsen for several weeks, to consult an eye doctor promptly.
She highlighted that early detection is vital at all ages, including for children, where rare but life-threatening eye cancers like retinoblastoma may only be identified through a comprehensive eye exam.