Visibility problems? Do you need, for whatever reason, to increase the size of an area of your screen, whether to capture a pixel or just to see it better? The solution to your problem is a magnifying glass, or a magnifying software like this one: ozZoom.
This is a very controllable program, both because of the concept simplicity and also because of its light weight. It works to zoom into the area of the screen you are pointing at with the mouse cursor. The zoom multiplies: 2x 4x 6x 8x ... etc, and all you have to do to get the desired zoom is go to the ozZoom window and select the desired level.
ozZoom is a completely free tool that doesn´t take up much space on your hard drive: just 200KB. From now on you can say goodbye to problems of seeing what´s on your screen.