What are the two main types of blepharitis?

• A. Anteriors and Posterior
• B. Acute and Chronic
• C. Internal and External
• D. Staphylococcal and Seborrheic

Answer: (D)

Blepharitis is often described by its cause, not just where it happens on the eyelid. The two main etiologic forms you’ll see most in practice are staphylococcal and seborrheic blepharitis. Staphylococcal blepharitis comes from Staphylococcus colonization on the lid margin, typically with lash crusting, lid redness, and sometimes marginal telangiectasia. Seborrheic blepharitis is tied to seborrheic dermatitis and presents with greasy, yellowish scales along the lid margin and lashes, with inflammation that can be more diffuse.

The other options describe either location (anterior vs posterior), duration (acute vs chronic), or other nonstandard distinctions, which is why they aren’t the primary two categories used in many NBEO-style questions.