what is the cause of conjunctivitis?

Answer 1

Inflammation of the thin, transparent layer covering the front of the eye and inner surface of the eyelid. The eye will appear red, irritated and sometimes swollen.
There are three types of conjunctivitis. The most common is infections form, which is commonly referred to as pink eye. This form is caused by contagious bacteria or viruses and causes the eye to become red, swollen, inflamed, blurry and itchy. Antibiotics are usually prescribed. (If your friend has pink eye and rubs his eye then touches a pencil that you then use and then scratch your eye, you will most likely catch the virus.)
The second form is allergic. It can be brought on by pets or pollen etc. The third is chemical. Like chlorine and air pollution.This usually can be taken care of with over the counter drops or cool compresses.

Answer 2

Pink eye or conjunctivitis refers to a redness or irritation of the membranes on the inner part of the eyelids and the membranes (conjuctiva) covering the whites of the eyes. These membranes react to a wide range of bacteria, viruses, allergy- provoking agents, irritants, and toxic agents, as well as to underlying diseases within the body. Viral and bacterial forms of conjunctivitis are common in childhood but can occur in people of any age. Overall however, there are many causes of pink eye. These can be classified as either infectious or noninfectious.

The leading cause of a red eye is virus infection. Viral pink eye symptoms and signs are usually associated with more of a watery discharge, not green or yellow in color, and is frequently associated with viral "cold-like" symptoms. The eyelids may be swollen. Sometimes looking at bright lights is painful. While viral pink eye may not require an antibiotic, those affected should see a doctor, as occasionally this form of pink eye can be associated with infection of the cornea, (the clear portion of the front of the eyeball). This infection must be correctly detected and treated. Viral pink eye is highly contagious. Viral pink eye usually resolves in seven to ten days after symptoms appear.

Bacterial Pink Eye

The bacteria that most commonly cause infectious pink eye are staphylococci, pneumococci, and streptococci. Bacterial pink eye symptoms include:

eye pain,
swelling,
redness, and
a moderate to large amount of discharge, usually yellow or greenish in color.

Answer 3

probably sticking your fingers in your eye or near your eye. not washing your hands and touching germs then rubbing your eye or touching around it. it spreads to the eye tear duct and get infected or clogged.

Answer 4

its a viral infection its in the environment.