Age-related macular degeneration (AMD) is a disease that affects a person's central vision. AMD can cause severe loss of central vision, but it rarely causes blindness. Risk factors for AMD include being over 50, smoking, having high blood pressure and eating a diet high in saturated fat. Definition of the pathology
Astigmatism occurs when either the front surface of the eye (cornea) or the lens inside the eye has irregular curves. Instead of having a single curve like a round ball, the surface is egg-shaped. This causes blurred vision at all distances. Definition of the pathology
Bacterial conjunctivitis is an infection of the mucous membrane of the eye, the conjunctiva, which extends from the back of the eyelids (palpebral and tarsal conjunctiva) through the fornices and onto the eyeball (bulbar conjunctiva) until it fuses with the cornea at the limbus. Definition of the pathology
Blepharitis is an inflammation of the eyelids. Blepharitis usually affects both eyes along the edges of the eyelids. Blepharitis usually occurs when tiny oil glands near the base of the eyelashes become blocked, causing irritation and redness. A number of diseases and conditions can cause blepharitis. Definition of the pathology
A cataract is a clouding of the lens of the eye. If you have a cataract, your vision may become cloudy, blurred or unclear. You may experience halos around lights, double vision and poor night vision. Colours may appear faded. Definition of the pathology
A chalazion is a small bump on the eyelid caused by a blockage of a tiny oil gland. The eye is the organ of sight, a nearly spherical hollow sphere filled with fluids (humours). The outer layer or tunic (sclera, or white, and cornea) is fibrous and protective. Definition of the pathology
Glaucoma is a group of eye diseases that can cause vision loss and blindness by damaging a nerve at the back of the eye called the optic nerve. The symptoms can start so slowly that you may not notice them. The only way to know if you have glaucoma is to have a full dilated eye exam. Definition of the pathology
A stye is a painful red bump on the edge of your eyelid. Similar to an acne pimple, a stye forms when a tiny oil gland near the eyelashes becomes blocked and infected. Styes are very common and in many cases can be treated at home. However, some cases may require treatment by an eye care professional. Definition of the pathology
Viral conjunctivitis is a highly contagious acute conjunctivitis usually caused by an adenovirus. Symptoms include irritation, photophobia and watery discharge. Diagnosis is clinical; sometimes viral cultures or immunodiagnostic tests are indicated. Definition of the pathology
