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    Related: Pterygium, Red eye
    Comprehensive Ophthalmology, Cornea/External Disease, Neuro-Ophthalmology/Orbit

    The extension of this actinic process onto the cornea is called a pterygium. A pterygium is a thin sheet of fibrovascular material that grows most commonly on the nasal side of the cornea. As a pterygium becomes apparent, it frequently becomes red and inflamed when exposed to irritants such as drying or sunlight.