However, these are false eyelashes and not eyelash extensions. Mega volume lashes are 10 or more super-thin eyelash extensions. Among many advantages, there are some disadvantages to the eyelash curler. Along with mink hair, it's also a common choice for eyelash extensions and similar cosmetics. The eyelash grows at the edges of the eyelid and protects the eye from dirt. Eyelash hair is not androgenic and is therefore not affected by puberty. Accordingly, some women seek to enhance their eyelash length artificially, using eyelash extensions. Pre-made fans are ready-made volume eyelash extensions. There was a clinical trial in 2011 that tested an eyelash gel called bimatoprost. Bimatoprost is available as treatment for eyelash growth. According to Allergan, noticeable eyelash growth occurs within 16 weeks. "Demodex folliculorum" and "Demodex brevis", both frequently referred to as eyelash mites. The upper lid fold can range from above the eyelash line to about . The glands of Zeis contain the individual eyelash. The glands of Zeis service the eyelash.