This design allows monocular vision through the telescope, and improves appearance of a mounted telescopic system. All of these designs are innovative ways to use a telescope to improve distance vision as well as intermediate vision in some instances. These free both hands to hold reading matter or other materials for close work. This type of aid also allows for the widest field of view for reading. A low vision professional can make recommendations for magnifiers for specific tasks based upon the vision of the individual.
Cost is a major drawback.
CCTV also is less portable than glasses or magnifiers. 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.