Saturday, 4 February 2017

Eyelashes

Eyelashes protect the eye from debris and perform some of the same function as whiskers do on a cat or a mouse in the sense that they are sensitive to being touched, thus providing a warning that an object (such as an insect) is near the eye (which then closes reflexively).Like all the hair in the human body, eyelashes are a biological polymer, made up of about 10 per cent of water and 90 per cent of proteins, such as keratins, and melanins, the substances that give hair its color. And, as all the human hair, they are fed by follicles, located below the skin. There are many particles in the air, like dust and sand, which can get into your eyes and harm them. Your eyelashes help to tell your eyelids when they need to shut to protect the eyes. Along with your eyebrows and forehead, your eyelashes also help to shield your eyes from the bright light of the sun. The anagen phase is also called the growth phase. This is the phase when lashes are actively growing, and it lasts between 30 and 45 days. Only about 40 percent of the upper lashes and 15 percent of the lower lashes are in the anagen phase at any one time. Each lash will grow to a specific length and then stop.

Information from:
http://www.livestrong.com/article/104762-eyelash-growth-cycle/
http://www.visioneyeinstitute.com.au/article/eyelashes/
http://wonderopolis.org/wonder/why-do-we-need-eyelashes
https://en.wikipedia.org/wiki/Eyelash
Image from: http://cdn2.blisstree.com/wp-content/uploads/2013/05/shutterstock_50402491.jpg

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