What is the best definition of cataract?

What is the best definition of cataract?

1 : a clouding of the lens of the eye or of the cover around the lens that blocks the passage of light. 2 : a large waterfall. 3 : a sudden rush or flow like a waterfall.

Why is it called a cataract?

“Cataract” is derived from the Latin cataracta, meaning “waterfall”, and from the Ancient Greek καταρράκτης (katarrhaktēs), “down-rushing”, from καταράσσω (katarassō) meaning “to dash down” (from kata-, “down”; arassein, “to strike, dash”).

What’s the difference between a waterfall and a cataract?

As nouns the difference between waterfall and cataract is that waterfall is a flow of water over the edge of a cliff while cataract is (obsolete) a waterspout.

What is a 2 cataract?

A 2+ NS cataract. This is a 2+ cataract under dim lighting. You can see that the nucleus is still the same density as the anterior / posterior embryonal zones.

What are rapids and waterfalls?

Rapids are stream sections with extremely strong currents, numerous obstacles, and steps in their streambeds. A waterfall is a vertical drop in a streambed. Both are sites of vigorous erosion . Rapids often form where resistant bedrock confines a stream to a narrow channel, and forces an increase in water velocity.

What are cataracts river?

Cataracts are waterfalls on very large rivers. They do not have to be high, but they carry enormous volumes of water. The word cataract is not used for most waterfalls. It is used for waterfalls along the River Nile in Egypt, which are little more than steps, but there are steps in other places, too.

What is a 2 Cataract?

What are the 3 main types of age related cataract?

There are three primary types of age-related cataracts: nuclear sclerotic, cortical, and posterior subcapsular. As a person ages, any one type, or a combination of any of these three types, can develop over time.

What is cataract in geography?

The term cataract is usually applied to that section of a rapidly flowing river where the running water falls suddenly in a sheer drop.

What is cataract history?

Cataract History. Cataracts have been known to mankind for centuries. A cataract is a white or cloudy patch that develops in the eye lens, reducing the amount of light that passes through it and leading to blurred vision. The word cataract comes from the Latin word “cataracta” meaning waterfall, with the condition possibly therefore named after…

What are the symptoms of cataract surgery?

Cataract surgery facts Early symptoms of cataracts include blurred vision, glare, and difficulty reading. Cataracts will affect most people and become more prominent as we age. Cataracts can be diagnosed when the doctor examines the eyes with specialized viewing instruments.

Do you have cataracts?

Cataracts are very common in older people. By age 80, more than half of all Americans either have a cataract or have had cataract surgery. A cataract can occur in either or both eyes. It cannot spread from one eye to the other.