Allergies: it is caused by the highly sensitive immune system which induces a wrong and exaggerated immune response, which protects the body from harmful substances such as bacteria and viruses. Antihistamines relieve symptoms.

Corneal ulcers: are usually caused mainly by an infection by bacteria, viruses, fungi or amoeba, they can also be caused by scratches or foreign bodies, severe allergic eye disease and various inflammatory disorders. Antibiotics, antivirals, and occlusion of the eye.

Corneal dystrophies: The most frequent are usually epithelial, stromal, endothelial, or combined, they can be associated with diseases such as glaucoma, they can lead to blindness and the treatment in many cases is penetrating keratoplasty or total corneal transplantation and dystrophy the most common is keratoconus.

Corneal edema: it is caused by the accumulation of fluid in the cornea, it can be produced by different causes: A) primary endothelial defect (Fuchs' dystrophy or congenital hereditary endothelial dystrophy). B) posterior polymorphous dystrophy appears from the beginning in the stroma, progresses and is irreversible. C) endothelial defect secondary to various pathologies (inflammation, trauma, surgery, hypoxia). D) Corneal edema with normal endothelium produced by increased intraocular pressure. E) Corneal edema due to epithelial alteration (erosions, trauma), located in the vicinity of the epithelial lesion.

Neovascularization: The cornea is a tissue lacking blood vessels, when these invade the cornea, it is always due to corneal alterations or pathologies.

Corneal opacity: it is a disorder of the cornea due to an infection, injury or inflammation of the eye. Additionally, wearing contact lenses for a long period of time can increase your risk of eye infections and increase your likelihood of developing corneal opacity.

Herpes simplex virus: Which is easily transmitted to the eyes.

Keratitis: these are inflammatory processes that affect the cornea, they can be superficial or deep. The most frequent are foreign body trauma (splinters), prolonged exposure to ultraviolet radiation, skiers and people who use sunbeds; viral, bacterial infections, etc. They have intense pain in the eye and the light bothers. The pain increases with blinking, when rubbing the edge of the eyelid with very sensitive corneal lesions, relieved by keeping the eyes closed.