Corneal abrasion is a scratch to the surface of the cornea of the eye. Cataracts and cloudiness of the cornea (corneal opacity) are common. Lesions of the retina and clouding of the cornea may occur. Refractive surgery permanently changes the shape of the cornea. The collagen of the sclera is continuous with the cornea. This includes infections of the eyelids, conjunctiva, and cornea. This substance forms a film that protects the cornea and the conjunctiva from pathogenic organisms. A large chalazion can cause astigmatism due to pressure on the cornea. This can cause glaucoma, uveitis, or damage to the cornea. It can lead to keratitis secondary to exposure of the cornea. The anterior segment is made up of the cornea, iris and lens. Neutrons are particularly damaging to soft tissues like the cornea of the eye. It is present in the cornea and lens of the eye in crystalline form. This will result in progressive ulceration of the cornea. The film depicts cornea, liver and kidney transplants.