Anterior blepharitis affects the outside of the eyelid where your eyelashes are attached. This can be caused by bacterial (or sometimes viral) infection. If left untreated, anterior blepharitis can lead to thickened and inward-turned or outward-turned eyelids and even vision problems from in-turned eyelashes damaging the cornea.

Posterior blepharitis is a condition that results from a dysfunction of the eye's tiny oil glands (meibomian glands) in the eyelids at the base of the eyelashes. When meibomian glands become clogged from posterior blepharitis, it can also can cause a stye or chalazion to form. Posterior blepharitis also leads to thickened eyelid margins and crusty eyelids. With this type of blepharitis, tears can even look foamy.

Blepharitis-illustrationMany people have both anterior and posterior blepharitis at the same time in varying degrees.

Rosacea blepharitis is associated with ocular rosacea, a condition that causes eyelid swelling and redness due to malfunctioning oil glands.  Acne rosacea is a common skin condition that leads to pimple-like bumps and facial redness.

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