University of Pennsylvania has crafted a silicon chip that could accurately mimics retinal functions. The chip has been built with an ability to approximate the neural function of human retina using its light sensors. The circuitry consists of 5,760 phototransistors that transmit light and other data to a series of 3,600 transistors, which resolves the data into picture that is seen by human eye with healthy retinas. So far the results are not good but satisfactory. Some thing is better than nothing; and indeed, this invention is a blessing for the blind people.