2082 An eyelash refers to one of the hairs that grows at the edge of the eyelid.
An eyelash grows in three layers on the edge of the eye lids.
Eyelashes protect the eye from debris, dust and small particles.
Eyelashes are sensitive to touch, providing a warning that a foreign object is near the eye, which then closes reflexively.
The eyelashes develop from the ectoderm between the 22nd and 26th week of pregnancy.
Natural eyelashes do not grow beyond a certain length.
There are approximately 100 cilia on each upper eyelid, and 50 on the lower eyelids.
The eyelash roots are located on the anterior surface of the tarsus.
Cilia travel between the orbicularis oculi and the muscle of Riolan and exit the skin at the anterior lid margin.
Eyelashes fall off by themselves without any need for trimming.
Eyelashes take about seven to eight weeks to grow back if pulled out.
Their color may differ from that of the scalp hair, although they tend to be dark on someone with dark hair and lighter on someone with light hair.
Eyelash hair is not affected by puberty.
The eyelid follicles are associated with the glands of Zeis and the glands of Moll.
Diseases or disorders involving the eyelashes include:
Madarosis is the loss of eyelashes.
Blepharitis is the inflammation of the lid margin.
Distichiasis is the abnormal growth of lashes from certain areas of the eyelid.
Trichiasis (ingrown eyelashes).
Infestation with parasitic crab louse.
Hordeolum, or stye.
Trichotillomania
Demodex folliculorum mites live harmlessly in eyelash and other hair follicles in about 98% of people.
Latisse received FDA approval for eyelash growth.
Latisse is a solution of bimatoprost that provides noticeable eyelash growth within 16 weeks.
Latisse eyelash growth occur primarily on the upper eyelashes.