Accessibility in Windows 7

To set the lens size

1. 
   Open Magnifier by clicking the Start button, clicking All Programs, clicking Accessories, clicking Ease of Access, and then clicking Magnifier.
   
2. 
   Click the Options button, and then, under Magnifier Lens Size, move the sliders to adjust the size of the Magnifier lens. The lens size changes right away. Adjust the level until it's right for you.
   

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  You must be using lens mode for the lens size options to appear.
  
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  You can quickly change the lens size by pressing Ctrl+Alt+R, and then moving the pointer up and down to change the height, and left and right to change the width.