Top Magnifier? The Bierley monomouse
This is not what a lot of people would regard as a magnifier. It is not a simple lens but a technological solution to magnification. This is a serious piece of kit when vision has deteriorated to the point where simple magnifiers no longer help.
The monomouse can be attached to either a computer screen via software or to a TV screen. It looks just like a standard computer mouse. You use it like a computer mouse running it over whatever text you want to read, inside the mouse is a tiny camera that transmits the image of the text to the screen. The principle is very simple, which makes it a cost effective solution for an electronic magnification system.