Definition of Orbital cellulitis:

Orbital cellulitis is an acute infection of the tissues immediately surrounding the eye, including the eyelids, eyebrow, and cheek.

Causes, incidence, and risk factors:

Orbital cellulitis is a dangerous infection with potentially serious complications.

Bacteria from a sinus infection (often Haemophilus influenzae) usually cause this condition in children. Children up to age 6 - 7 seem to be particularly susceptible to infection with this type of bacteria. However, the rate of severe orbital cellulitis has dropped steadily since the introduction of HiB (Haemophilus influenzae B) vaccine.

The bacteria Staphylococcus aureus, Streptococcus pneumoniae, and beta-hemolytic streptococci may also cause orbital cellulitis.

Other causes include a stye on the eyelid, bug bites, or a recent eyelid injury.

Orbital cellulitis infections in children may get worse very quickly and can lead to blindness. Immediate medical attention is needed.