In July of last year, researchers in France described a rather disturbing example of what could happen if you’re not careful about cleaning your contact lenses. A 17-year-old patient had been wearing monthly lenses well past their expiration date, and rinsing them with a cleaning solution she’d diluted with tap water. The end result was an eye infection. Luckily, a bit of care managed to clear it up.

Giant viruses being built inside an infected cell.

Reference:

http://arstechnica.com/science/2012/10/contact-lens-solution-hosts-giant-virus-ecosystem-of-parasites/

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