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The latest incarnation I tried out recently is a similar unit but designed to plug into the USB input of a computer (Figures 1 and 2). This allows the magnified image of the text or image under the mouse to be presented on screen. The magnification will depend upon the size of screen to which the viewing window is maximised, but on a standard laptop screen a size of around eight times was achieved (Figure 3). The handset includes a small blue button which switches the image from simple black on white to colour and then to reverse white on black (Figure 4). I found the colour image excellent for high resolution images but for newspaper quality images the magnified representation proved too pixellated.
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