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Misuse of contact lenses (wearing them too long, not cleaning them properly) causes 1 million eye infections/yr in US. "Contact lenses offer many benefits, but they are not risk-free. Keratitis can be a scary infection, but it is preventable if people follow healthy habits and take care of their eyes and their lenses". Some bad habits, such as sleeping with contact lenses, failing to clean and replace lens solution frequently, and letting contact lenses get wet while swimming or in the shower, greatly raises the risk for keratitis. People who wear their contact lenses overnight are more than 20 times more likely to get keratitis. http://buff.ly/1xw4iSn

A few basic 'contact lens hygiene' measures can keep patients free of keratitis -- Keratitis and Contact Lens Use - CDC, YouTube:

From Bertalan Mesko: "I use wearable gadgets to measure the quality of my sleep and as some of the subscribers asked me how I do that in details step by step, I thought I would share the whole process and my methods in one video. I hope you will find it useful."

The history of how helmets arrived on the football field, from TIME:

How did the anti-vaccination movement begin? CNN's Deborah Feyerick takes a look at the origins behind the anti-vaccination movement and how is has impact the measles outbreak.

Dandruff is a common scalp condition in which small pieces of dry skin flake off of the scalp. The most effective way to treat and control dandruff is to use dandruff shampoo and scalp treatments. Some patients may need to use several different shampoos in succession. Follow these tips from dermatologists to get the best results.