GROSS ANATOMY

Detailed explanation-1: -Normal anatomy: The upper eyelid has between 90 to 160 lashes; the eyelash bulbs are in the orbicularis oculi (called the muscle of Riolan at the eyelid margin) anterior to the tarsus and the body of the lash exits through the eyelid margin, anterior to the meibomian gland orifices.

Detailed explanation-2: -Cilia incarnata is the misdirection of eyelashes whereby they grow under the skin through to the surface or posteriorly to the conjunctival surface instead of emerging normally from the eyelid margin. Two types are recognized: Cilium incarnatum internum.

Detailed explanation-3: -Eyelashes (cilia) can grow in abnormal locations and directions, resulting in significant eye problems when they contact the eye surface. Distichia are eyelashes that originate from the meibominan glands that line the eyelid margin, which normally do not produce hairs.

Detailed explanation-4: -Distichiasis means that you have an extra set of eyelashes that have grown in the wrong place on your eyelids. Treatment ranges from eye drops to surgery to remove the lashes.