Using the iPhone (or any mobile smartphone or tablet device, really)  for medical purposes isn’t a new thing, but it’s nice to see the  applications people cook up. Just recently at Disrupt we saw 
Smartheart, and apps like 
Skin Scan are decentralizing some simple self-monitoring tasks like melanoma detection.
We’ve also seen lots of physical additions to the iPhone camera. You can get wide-angle lenses, telephotos, and even a 
12x microscope lens.  But a team of researchers at UC Davis has one-upped the competition by  making the iPhone into a 350x microscope for very little money. Now  you’ll be able to send people Instagrams of your blood cells.
It should be said right off the bat that this isn’t something that 
only the  iPhone can do. But it’s the go-to device for proof of concept stuff  like this for obvious reasons. The technique can be generalized to other  devices later.
The project is actually quite a simple little hack. They use a 1mm  ball lens and attach it to the outside of the iPhone lens array with a  rubber sheet and some tape. The little lens technically only offers 5x  magnification, but the way it focuses creates a tiny in-focus area that  can resolve details down to about 1.5 microns. The field of view is very  small and there’s distortion to deal with, but by combining the  in-focus areas of several pictures you can get a clear enough image to  identify cell types, make counts, or even take spectroscopic readings.
Take a look at these images: the ones on the top were taken with a  full-on commercial medical microscope, the ones on the bottom are from  the iPhone setup:
There’s obviously a major difference in quality, but the difference  in price is even greater, and high-quality microscopes aren’t very  mobile.
Essentially it’s one more step towards a tricorder. With a  general-purpose CPU, modular inputs, and a versatile imaging unit, the  smartphone is useful for far more than calling friends and playing Angry  Birds. It may not be a mobile clinic, but in areas where money and  electricity are hard to come by, an iPhone could be a valuable  diagnostic tool. Extending the “senses” of our devices via cheap  components and elbow grease could seriously empower decentralized  medical care.
Source :
http://techcrunch.com/2011/10/07/turning-the-iphone-into-a-350x-medical-microscope-for-under-50/
 
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