Since the clip-on costs just $1, it will be targeted at the developing world.
Created by Media Lab Camera Culture director Ramesh Raska, the clicp-on is named Catra system. Catra is relatively simple. A User begins by sliding a plastic eye-piece onto a smartphone then peer through the lens (as shown the photos). Detecting the eye, the application in the smartphone puts light to each area of the eye. Using the phone’s arrow keys, the user adjusts the light’s brightness to each area of the eye until the user perceives that each area has the same brightness. Once this happens, the smartphone’s application knows which areas required greater light intensity and which required less. With this information, the app can then make a visualization of the user’s eye and a medical professional can determine if the user has cataracts.
Catra has been found to be quite effective. In one test it diagnosed a cataract in a person, whose cataract remained undiagnosed previously when a doctor ruled out the presence of any cataract.
Check out the Catra demo video below.
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