Enhanced vision has launched Transformer, a portable USB magnifier that can be easily connected to a laptop, monitor or LCD. It has a 330 degree rotating camera which captures the image and reproduces the text on your device in your selected font/ background colour. It provides upto 30x magnification and 28 custom preselect colour modes.
Here is more information:
Price is not listed on their website but I feel it will be expensive. All products by Enhanced Vision are unfortunately very expensive.