Our team has developed a diagnostic device to determine individual prescriptions. At this point in the project, we’ve created a working prototype in our lab at Bucknell, as well as another prototype that was fabricated in San Pedro in May 2012 using local materials and labor. A user looks through the device (which is stabilized by a tripod) at a distant eye chart and makes adjustments until the object becomes in focus. Demarcations on the device will correspond to spherical and cylindrical correction. We have developed this device with materials that cost about $12.00 in the United States. The principle materials are PVC piping and two polycarbonate lenses. We’ve purposely chosen these materials in order to make the price accessible to entrepreneurs in the developing world. Our goals for this device are that it gives accurate readings of prescriptions and that local people will be able to use this device with little training. One of the most unique aspects of our diagnostic tool is that we have the capacity to diagnose astigmatism, a common problem around the equatorial regions. The device is still been tuned for accuracy.