1. Be My Eyes. http://bemyeyes.com/
2. Common problems of people with low vision. http://www.allaboutvision.com/lowvision/helping.htm
3. Horus wearable device. https://horus.tech
4. Microsoft cognitive services. https://azure.microsoft.com/en-us/services/cognitive-services/?v=17.25b#vision
5. Pytesseract. https://pypi.python.org/pypi/pytesseract