The objective of this study is to compare the safety and efficacy of azithromycin ophthalmic solution, 1% versus placebo over a four-week treatment period.

Inclusion Criteria:

• Have best corrected visual acuity in both eyes of at least +0.7 or better
• If female, are non-pregnant or non-lactating
• Have a current diagnosis of blepharitis in one or both eyes

Exclusion Criteria:

• Have lid structural abnormalities
• Have suspected ocular fungal or viral infection
• Have practiced warm compress therapy within 14 days prior to Visit 2
• Unable to withhold the use of contact lenses during the treatment or follow-up periods
• Unable to withhold the use of ocular cosmetic products within 24 hours prior to study visits
• Have had penetrating intraocular surgery within 90 days prior to Visit 2
• Have had ocular surface surgery within the past year prior to Visit 2
• Have a serious medical condition which could confound study assessments