What is a cataract in geography

slideshare.netThe term cataract is usually applied to that section of a rapidly flowing river where the running water falls suddenly in a sheer drop. When the drop is less steep, the fall is known as a cascade. Related category. Encyclopedia index.

What are the causes of cataracts?

Other causes of cataracts include diabetes, trauma to the eye, smoking, certain medications (corticosteroids and phenothiazines), high alcohol intake, unprotected ultraviolet (UV) exposure, nutritional deficiency, and eye surgery. In rare cases, cataracts may be present at birth or shortly thereafter.

What does cataract mean in history?

The meaning of “cataract” we’re most familiar with is also the oldest. It dates to the 14th century and comes from the Latin word cataracta, meaning “portcullis,” probably because the ocular cataract obstructs vision in a way reminiscent of the way the portcullis’s heavy iron grating obstructs passage into a fortress or castle.

What is the word origin of cataract?

Cataract(noun) in medical refers to the disease that involves opacification of the eye lens. Apart from the medical usage, the word also refers to a gigantic waterfall or a pelter. The brobdingnagian amount of water falling from higher up is referred to as cataract in general.

What do cataracts look like?

A cataract is a cloudy area in the lens of the eye. It can look like a speckle, crystal or stripe. If the cataract is large or dense enough, it can cause blurry vision or block vision. Most cataracts are partial (not involving the whole lens), but they can sometimes be complete (involving the whole lens). A cataract may be in one eye or both eyes.

How can I keep cataracts from getting worse?

A recent study has shown that the risk for Cataracts

A condition affecting the eye that causes clouding of the lens.

can be reduced by eating a healthy diet that is full of antioxidants from fruits and vegetables. You can learn more about how to keep cataracts from getting worse by speaking to your doctor. If surgery is needed, the staff at Iowa City Ambulatory Surgical Center is always ready to help.

What causes cataracts and how to prevent them?

What Causes Cataracts | 9 Possible Reasons.

  • 1. Aging. The eyes mainly consist of water and protein. As we grow older, some of the protein may form chunks and cloud a certain area of the eyes
  • 2. Ultraviolet Rays.
  • 3. Diabetes.
  • 4. Hypertension.
  • 5. Obesity.

What medications can cause you to get cataracts?

Certain medications can also cause cataracts, including:

  • chlorpromazine*, a sedative
  • amiodarone, a heart medication
  • phenytoin, an antiseizure medication used in epilepsy
  • lovastatin, a cholesterol-lowering medication
  • corticosteroids such as prednisone that are used to reduce inflammation

What part of the eye is affected by cataracts?

At first, the cloudiness in your vision caused by a cataract may affect only a small part of the eye’s lens and you may be unaware of any vision loss. As the cataract grows larger, it clouds more of your lens and distorts the light passing through the lens. This may lead to more noticeable symptoms.