Despite these drawbacks, it does allow the view to adjust various parameters such as size, contrast, and brightness to the persons needs. Reverse polarity allows the letters to appear light on a dark background, to reduce glare. CCTV is quite helpful in the workplace or school. Non-optical aids include a variety of devices such as black felt tip pens, dark linked paper, writing guides, filters, or lamps. Writing guides are templates with open areas along the lines to keep writing aligned.
Many individuals discover techniques very helpful for themselves and others.
Training in their use is available. NOAH News periodically updates information on this rapidly changing area of technology. In summary, low vision rehabilitation combines basic optical principles and innovation to enhance the visual functioning of the visually impaired. With the variety of low vision aids available, all visually impaired should have their vision carefully measured and have the experience of trying the appropriate power of each recommended aid, to determine which would be best suited to their situation. The American Foundation for the Blind maintains a directory of low vision clinics throughout the United States.