Sign language is based completely on sight-the ability to see the signs that someone is producing. But what about those who are Deaf and also have limited or no sight, like Helen Keller? Do 5-10 minutes of quick research to find out what kind of tactics are available for those who are deaf and have limited sight (but are not fully blind). How can their interpreter make sure that their signs are easier to see and understand? Do any of these tactics surprise you?