Normally aligned eyes move together and look in the same direction at the same time, which is essential for normal vision. When eyes are misaligned, uncoordinated movements of the eye muscles cause each eye to look in a different direction.…
Orbital cellulitis is inflammation of the soft tissue of the orbit (the bony socket in the skull that contains the eyeball). The condition usually occurs when bacteria from a sinus infection, from a penetrating injury to the orbit, or from…
Exophthalmos is a condition in which one or both eyeballs bulge forward, exposing an abnormally large part of the front of the eye. The most common cause of the condition is Graves’ disease, an autoimmune disorder that causes the thyroid…
Color vision deficiency (also called color blindness) is a vision disorder in which a person sees colors differently than other people see them or has difficulty distinguishing shades of some colors. The disorder occurs when malfunctioning receptor cells for color…
Cancer cells can spread through the bloodstream or the lymphatic system from a tumor in one area of the body to form a tumor in another part of the body, including in the eye. Treatments A secondary tumor is treated…
Retinoblastoma is a rare, malignant tumor of the retina that occurs in one or both eyes, usually in children between ages 2 and 3. Because retinoblastoma is often inherited, you should seek genetic counseling before having children if you know…
Malignant melanoma is a cancer that can affect the eyes as well as the skin, and is the most common type of cancer that occurs inside the eye. Malignant melanoma usually occurs in the choroid (the layer of blood vessels…
Optic neuritis is inflammation of the optic nerve, which disrupts the flow of signals from the retina to the brain and impairs vision. The condition usually develops between ages 20 and 40. In rare cases, optic neuritis results from an…
Choroiditis is inflammation of the choroid, the layer of blood vessels beneath the retina (the light-sensitive membrane lining the back of the eye) that supplies the eye with oxygen and nutrients. In some cases, the retina and the vitreous fluid…
The central retinal vein carries oxygen-depleted blood away from the retina (the light-sensitive membrane lining the back of the eye). In rare cases, usually in middle-aged or older people, the central retinal vein or one of its branches becomes blocked…