The causes of conjunctivitis include:
Bacteria
Viruses
Allergies
A foreign object in the eye
A chemical splash in the eye
A blocked tear duct in a newborn

The doctor can treat conjunctivitis using artificial tears, applying warm or cold compresses several times daily and cleaning eyelids with a wet cloth. Antiviral medications are also used to treat viral conjunctivitis caused by herpes simplex virus.

Yes, conjunctivitis can be prevented by following hygienic practices, such as
Using a clean towel and washcloth daily
Washing the hands before touching the eyes
Avoiding sharing of towels or any washcloths
Changing pillow cases regularly
Avoiding sharing eye cosmetics or any personal eye care items
Avoiding the use of cosmetic such as mascara

Conjunctivitis can lead to inflammation of the cornea, affecting the sight, in adults and children. In a newborn baby, there is a high risk of complications, such as meningitis and blood poisoning.

You can consult an eye doctor for simple conjunctivitis or an ophthalmologist to treat severe cases of conjunctivitis.