Closed Circuit Televisions (CCTVs)
Mail, maps, work products, newspapers and other paper text or graphics can be accessed using a Closed Circuit Television (CCTV) System. A CCTV system can enlarge the type or graphic on a page up to two to sixty-four times its original size.
The starting point for a CCTV system is a camera. The camera creates the picture that will be transmitted to the control position. A lens is added to the front of the camera to enlarge the text. The unit also has a zoom feature to allow the user to focus on a specific area of the document.
Many CCTV systems can reverse the color contrast; view image in color or black and white. When using with a computer some CCTV systems have split-screen technology. This means that a user can view one half of the magnifier image from the CCTV on their computer screen while still viewing whatever they have on the computer. (e.g. hand-written form and word processing form where data is going to be entered).
Types of Closed Circuit Televisions
CCTV Systems come in a variety of styles and amounts of magnifications. They can be portable or desktop versions. Typically they can be:
- Hand held with a built in monitor
- Hand held camera which is connected either to a computer monitor or a TV
- A self contained portable version
- A stand alone unit
- A camera unit used with a computer
Before anyone purchases a CCTV, they should consider having a low vision examination with either an optometrist or ophthalmologist who has had additional training in low vision.