Mini DisplayPort to VGA blurred

I'm using an early 2012 MacBook Pro 13 inch with a ViewSonic VG2230wm monitor using a Mini DisplayPort to VGA adapter plugged into the Thunderbolt port.
The resolution of the external monitor is set to 1680 x 1050 which is the recommended but the quality of the image is poor.  All text on webpages and documents has a slight shadow on it and is visibly poorer than the built in display on the MacBook.
My question is will I get a better result if I use a Mini DisplayPort to DVI adapter instead of VGA?  The monitor supports both.
Is there a better way of getting a crisp clean image on my external monitor?
Thanks,
Paul.

Edit:  I've just tried the same monitor and adapter on my Mac Mini with the same results.  The picture still looks slightly blurred and with a shadow.
The Mac Mini also has a Mini DVI port and when I use a Mini DVI to DVI adapter on the same monitor the picture is nice and crisp.
Will switching to a Mini DisplayPort to DVI fix my blurred vision?!?

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