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Pterygium

It is a group of blood vessels and tissues that begin to grow in the eye under that conjunctival area from the corner of the eye (internal or external) to the end of the cornea and has reached the inside of the cornea in some advanced cases. The nail is a simple disease that does not require treatment in most cases, but it becomes Danger when it reaches the cornea area and affects the quality of vision of the affected person, in which case it must be surgically removed as soon as possible. This is believed to be used with ultraviolet radiation from exposure to light (for example sunlight) and low humidity and dust. The extension of the conjunctiva on the side of the nose may be the result of exposure to the sun and its passage horizontally through the cornea, where it is subject to refraction and its focus becomes high on the area of ​​the limbus of the cornea.