The mechanism by which the bacteria causes symptoms of<unk>  is not fully understood and may include direct irritation of bacterial toxins and/or enhanced cell-mediated immunity to S. aureus. Staphylococcal<unk>  is caused by an infection of the anterior portion of the eyelid by Staphylococcal bacteria. In a study of ocular flora, 46% to 51% of those diagnosed with staphylococcal<unk>  had cultures positive for Staphylococcus aureus in comparison to 8% of normal patients. Staphylococcal<unk>  may start in childhood and continue into adulthood. It is commonly recurrent and it requires special medical care. The prevalence of Staphylococcus aureus in the conjunctival sac and on the lid margin varies among countries, likely due to differences in climate and environment. Seborrheic<unk>  is characterized by less inflammation than Staphylococcal<unk> ; however, it causes more excess oil or greasy scaling. Meibomian gland dysfunction is a result of abnormalities of the meibomian glands and altered secretion of meibum, which plays an imperative role in lagging the evaporation of tear films and smoothing of the tear film to produce an even optical surface. Posterior<unk>  is an inflammation of the eyelids, secondary to dysfunction of the meibomian glands. Like anterior<unk> , it is a bilateral chronic condition and may be associated with skin rosacea. There is growing evidence that, in some cases, it is caused by demodex mites.
Blepharitis
Periorbital cellulitis
Capillaritis
Ocular larva migrans
Orbital cellulitis
Sympathetic ophthalmia
Periorbital dermatitis
Corneal ulcer