Trichiasis is an uncomfortable condition in which the eyelashes are misdirected toward the eyeball and scratch the cornea. The position of the lid is normal, but the lashes are pointing in the wrong direction. This can cause abrasion, infection and scarring of the cornea.
The most common cause is chronic inflammation with scarring in the eye lid. Such scarring can occur from lid infections, skin diseases, or from trauma and poor healing of the lid tissues.
Treatment by simple removal of the lashes is only temporary, because within a few months the lashes return again and irritate the eye. However, removal does provide temporary relief. Permanent destruction of the lash follicle is the only way to prevent recurrences. This can be performed with electrolysis or cryotherapy.
Most of us have occasionally noticed brief twitching in our eyelids. This is called myokymia and can be annoying, but it is not serious. This is often more noticeable with fatigue, lack of sleep, stress, or excessive use of caffeine.
If eyelid spasms are more severe, more prolonged and do not resolve promptly, other more serious conditions, such as blepharospasm or hemifacial spasm may be present. These can be effectively treated with Botox (botulinum) injections.