The upper eyelid has about 90-150 eyelashes and the lower lid has 70-80. Eyelashes are attached to nerve sensors that trigger the eyelid to close upon contact with small particles. The aesthetic function of the eyelash is simply to frame the eyes as they filter foreign objects and protect the actual eye.
Know How Eyelashes Grow
Eyelash hair is like all hair on the body. Lash texture and growth cycle patterns are genetic. Each hair follicle grows several hairs throughout a lifetime. There are three growth phases in the eyelash growth cycle, anagen, catagen and telogen. Each phase is staggered, preventing periods of eyelash baldness when the lash cycle stops.
Eyelash Growth Cycle Phases
- Anagen- This growth phase typically is active between a 30-45 day period and vary according to genetics. The length of one's anagen phase dictates the length of their eyelashes. This phase can't be altered by medicine or eyelash serums because it is strictly genetic. Only 40% of the upper and 15% of the lower lashes are in an active growth stage at a time.
- Catagen- This growth phase is relatively inactive or intermediate, comes after the anagen phase and lasts between two to three weeks. The growth stops and no pigment is produced. The follicle's base shrinks near the skin's surface.
- Telogen- This growth phase is the shedding phase and this phase lasts the longest (three to four months). The follicle begins to grow new hairs. The new hair pushes up the old hair and allows it to share naturally. Baldness should never occur because each lash grows on its own time.
If a lash is pulled out, it will grow back. It does, however, take two to three months for the eyelash to fully grow. Growth can be stimulated by rubbing olive oil and/or coconut oil on the lash line daily for two weeks. 
Note: Eyelash extensions do not belong on terribly damaged eyelashes. Use olive and/or coconut oil simulative treatment before getting eyelash extensions.
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