What is a nail? Pterygium is a growth of the eye conjunctiva on the cornea, which is usually seen as red or pink tissue inside the eye. This disease progresses in the form of an arrow towards the center of the cornea. If the pterygium covers the center of the cornea, it causes severe vision loss. The most important factor that causes it is the ultraviolet rays of the sun.. Therefore, the most effective way to prevent pterygium is to use sunglasses.. Using a hat and reducing the duration of exposure to sunlight are important factors for preventing pterygium. What symptoms does pterygium cause? The pterygium cosmetically changes the natural appearance of the eye. This disease can start with the symptoms of redness and burning of the eyes and gradually, as it progresses on the cornea, it also impairs people's vision. Itchy eyes, dry eyes and watery eyes are other symptoms of pterygium In the first step to treat the annoying symptoms of pterygium, the ophthalmologist uses artificial tear drops and sometimes anti-inflammatory drops such as Corton. ### In what cases is pterygoid surgery performed? Although it may be thought that pterygium surgery is simple, it should be noted that in pterygium surgery, choosing the right technique and paying attention to details play an important role in the outcome of the operation. If the operation is not performed well, the patient will not achieve the desired aesthetic result and there is a possibility of recurrence or complications in the coming months or years. If the graft is not performed, the probability of recurrence and return of pterygium is higher. Sometimes embryonic layer grafting is used in pterygoid surgery.