The lens inside the eye is critical for crisp, clear vision. Without it we would need glasses as thick as Coke® bottle bottoms to see the world clearly. For most of our lives, the natural lens is flexible and clear - allowing us to see objects both in the distance and at near. Around the age of forty-five, however, the lens becomes rigid and is no longer able to change focus. This leads to the condition known as presbyopia. Although annoying, this condition is generally treatable with reading glasses or bifocals.
However, with time the lens in the eye hardens further resulting in blurred vision. Just as a piece of plexiglass exposed to sunlight will slowing turn grey, then yellow, then brown, so do our lenses lose clarity and change color. A discolored, or cloudy lens no longer allows all of the light through to the retina. When it blocks enough light to limit vision even with spectacles, the lens is generally considered to have become a cataract.
David Richardson, M.D.
Medical Director
San Gabriel Valley Eye Associates, Inc.
Website: http://www.sgveye.com/
Blog: http://www.about-eyes.com/
Cataract Audio CD: http://www.cdbaby.com/cd/DavidDRichardsonMD
San Gabriel Office:
207 S. Santa Anita St., Suite P-25
San Gabriel, CA 91776
(626) 289-7856
Pasadena Office:
800 E. Colorado Blvd.
Suite 450
Pasadena, CA 91101
(626) 289-2223
The origin of this word, like most medical terms, is from the Latin word - cataracta.
It means a physical barrier in the eye . When the lens in the eye becomes cloudy, it "blocks" light from entering and is a physical barrier - of sorts - in the eye.
I think Cataract means a waterfall
waterfall
A cataract is rushing liquids
In social studies, "front" can refer to a geographic area where armies engage in combat during a war, or it can represent a particular line of confrontation or conflict between groups or nations. The concept of a front is often used to describe the physical and ideological boundaries where opposing forces meet.
Environment means a certain surrounding, place, or a location in Social Studies.
maps
Place
be goog
Silt
Trade
It means that it is a social history that your studying.
In social studies, the term elevation refers to a person's socio-economic status or standing within a society. It can also mean the degree of influence or power a person holds in a particular group or community.
what does irrigation mean