It is tempting to buy the larger size screens. It may not be the most cost effective use of your money for several reasons. First, research has shown that most patients read fastest when between 8 and 15 letters are on the screen horizontally at one time. This is because more letters on the screen increases the need for eye and or head movements which slows the reading rate. Larger screens are therefore useful only when magnification in excess of 20X are required.
Image quality is FAR more important for most patients.
The main issue is whether these added features are going to be reliable. They do add significantly to the moving parts and things that can break. Cost The only drawback to more patients benefiting from use of these devices is their cost. Clearly, in real dollars, CCTV's are a relative bargain today, as compared to 20 years ago. The problem is that the average person who will be purchasing one is in living on a fixed income.