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Corneal Arcus or Arcus senilis   appears as a white, gray, or blue ring or arc around the cornea of the eye. The condition is usually seen in older adults but can affect people of all ages, even appearing at birth.   Arcus senilis   is generally harmless, and an involutional change modified by genetic factors. However, arcus is sometimes indicative of hyperlipidoproteinemia (involving low-density lipoproteins) with elevated serum cholesterol, especially in patients under 40 years of the age. Causes of corneal arcus Arcus is a deposition of lipid in the peripheral corneal stroma. Cholesterol and triglycerides are two types of fats in your blood. Some of the lipids in your blood come from foods you eat, such as meat and dairy products. Your liver produces the rest. Lipid deposition starts at the inferior and superior poles of the cornea and in the late stages encircle the entire circumstances.  Arcus senilis  is more common in men than in women. In people under ag...

The cornea is the clear dome shaped transparent, outermost layer of the eye, about 12 mm in diameter. It serves as a physical barrier against dust, microorganisms and other harmful particles. The cornea also plays an important role in vision. It filters some amount of ultraviolet light and protects iris, pupil and anterior chamber. As light is refracted by the curvature of the  cornea , it is focused on the object and forms a clear Image. Any infection, disease or trauma to the cornea can interfere with vision by blocking or distorting light as it enters the eye. It contains specialized tissue having no blood vessels and is nourished with your tears and aqueous humor (behind the cornea). Cornea is made up of three major components. Epithelium –  Cornea has numerous nerve endings, that’s why you experience pain while rubbing your eyes. It absorbs oxygen and nutrients from the tears. The epithelium is connected with stroma with the help of the basement membrane. Stroma –  T...