I picked up a magnifying light the other day which is 1.75x, and it has an arm that swings in front of it that says 4 diopter on it, whatever that means for magnifications.
It's much better than other ones I have tried, and when using it, it pretty closely looks like this:
![](http://farm2.static.flickr.com/1166/4733525539_3c79efabb9_b.jpg)