The concept of cataract , which comes from the Latin word cataracta (in turn derived from the Greek kataráktēs ). We can determine that this Greek word is the result of the sum of two clearly differentiated parts: "cata", which can be translated as "downwards", and "arassein", which is synonymous with "hit".
It refers to a waterfall : a vertical fall of water due to an abrupt drop in the channel or bed.
In general, the idea of a waterfall refers to a jump that is important due to the height of the drop and the flow of water. Otherwise the notion of cascade is usually used. It can be said, therefore, that a waterfall is a very large waterfall.
The characteristics of the falls change depending on the time of year . There are dry seasons where the river flow is reduced and therefore the falls have less water. On the other hand, in the rainiest season, the flow increases in both the river and the waterfall.
Niagara Falls are among the best-known waterfalls. They are formed by the Niagara River, on the border between Canada and the United States . Its fall is around 64 meters high.
The Iguazú Falls , considered one of the Seven Natural Wonders of the World according to an international vote, are located on the border between Brazil and Argentina . It is one of the most important tourist attractions in South America .
In addition to those already mentioned, there are other really important waterfalls such as Victoria Falls, which are located on the border between Zimbabwe and Zambia. They are about 108 meters high and 1.7 kilometers wide. Likewise, it should be noted that the famous Victoria Falls Bridge is located above them, which is made of steel and dates back to 1905.
It should be noted that cataract is also the name given to a vision disorder caused by the opacity , either total or partial, of the lens (a structure of the eye). When the lens becomes opaque, the passage of light is difficult, causing the person to have problems seeing normally.
Specifically, it is determined that there are three types of cataracts:
-Nuclear cataract, which is fundamentally the result of aging and affects the nucleus of the lens.
-Subcapsular cataract, which damages the back part of the lens. People who are most at risk of suffering from this type of cataract are those who take steroid drugs and those who suffer from diabetes.
-Cortical cataract, which occurs in the cortex of the lens.
Being advanced in age is one of the causes that can lead to suffering from this vision problem. However, there are other situations that can also cause the same. We are referring to obesity, smoking, diabetes, hypertension, high myopia or family history, among others.
The symptoms that indicate that a person suffers from cataracts are blurred vision, colors are perceived as less bright, you may have what is known as secondary vision...