Distichiasis refers to eyelashes that grow from the orifices of the oil glands along the eyelids. These oil glands naturally occur along the eyelids, however they are positioned closer to the eye. Since eyelashes typically do not grow from the openings of the oil glands, this location typically leads to eyelash-corneal/conjunctival touch.
This constant irritation can lead to changes that can affect vision and can be detrimental to corneal health. These lashes must be carefully treated as inappropriate obliteration may lead to destruction of oil glands, which are required for good ocular health.