eye disorders
Preseptal and Orbital Cellulitis
Introduction
Preseptal cellulitis(periorbital cellulitis) is infection of the eyelid and surrounding skin anterior to the orbital septum.Orbital cellulitisis infection of the orbital tissues posterior to the orbital septum. Either can be caused by an external focus of infection (eg, a wound), infection that extends from the nasal sinuses or teeth, or metastatic spread from infection elsewhere. Symptoms include eyelid pain, discoloration, and swelling; orbital cellulitis also causes fever, malaise, proptosis, impaired ocular movement, and impaired vision. Diagnosis is based on history, examination, and CT or MRI. Treatment is with antibiotics and sometimes surgical drainage. Preseptal cellulitis and orbital cellulitis are distinct diseases that share a few clinical symptoms and signs. Preseptal cellulitis usually begins superficial to the orbital septum, the membranous sheet that extends from the orbital rim into the upper and lower eyelid. Orbital cellulitis usually begins deep to the orbital septum. Both are more common among children; preseptal cellulitis is far more common than orbital cellulitis. 