MIT researchers recently created a smartphone device designed to detect cataracts. Called Catra, the device uses “off -the-shelf components” as opposed to the highly expensive and highly space consuming technologies normally used to detect cataracts.

The research group is part of the MIT media lab that won the MIT Global Challenge competition back in May. Taking advantage of mobility through mobile phones and an inexpensive design, Catra was designed for use in the developing world.

The device, which attaches to the screen of a smartphone, costs about $2, whereas a slit lamp examination conventionally used to examine cataracts cost up to $5,000. And unlike conventional slit lamp examinations, Catra does not need a skilled human operator to administer the test and read the results, Catra does everything for the patient.

Catra utilizes a technique, which allows the user to respond to what they visually experience.  It scans the lens of the eye section by section. The user then sees projected patterns and presses a few buttons to map the light attenuation in each section of the eye.  This information is collected by the device creating an attenuation map of the entire lens.  This allows individuals to monitor the progression of the severity of the cataract on their phones.

This is not the MIT media lab’s first project to improve the health of the eye. They are working on a series of projects involving eye care. They developed and released Netra, an application and smartphone attachment for eye exams via mobile phone, last year.

Cataract is a condition where clouding builds up in the lens of the eye. It is the leading cause of avoidable blindness worldwide. Furthermore, ophthalmologists, doctors that specialize on the eye, are scarce in the developing world with one ophthalmologist per million people in some areas. When cataract leads to vision loss, it prevents people from being productive citizens in their community. It leads to high levels of illiteracy and poverty, and can impair a society’s economic and health sectors.

Using mHealth to tackle cataract is a crucial development. However, smartphones are not ubiquitous in the developing world. And it’s for a reason. Even though the Catra device may be cheap, the phones on which they operate are much more expensive. This needs to be considered when implementing Catra on a wide scale in the field. However, with the potential of this kind of technology, it is likely that MIT media lab will find a way.