Conjunctivitis, commonly called "pink eye", is swelling (inflammation) or infection of the membrane lining the eyelids and part of the eyeball.  Symptoms can include one or more of the following:

• Redness of the eye(s)
• Blurred vision 
• Crusts that form on the eyelid overnight
• Eye Pain
• Gritty feeling in the eyes
• Increased tearing
• Itching of the eye
• Sensitivity to light

Click here to learn more - http://www.mayoclinic.org/diseases-conditions/pink-eye/basics/definition/CON-20022732

The Texas Department of State Health Services requires that children with suspected pink eye be excluded from school.  The child may return to school with permission and/or permit is issued by a physician or local health authority or when symptom free.