The highest contrast ratio of the VX2270Smh is 30000000:1. That's 50% more contrast ratio than a 20000000:1 PC screen, which is the most common contrast ratio. Across all similar spec LCD screens that have been on the market for around the same time as the VX2270Smh the worst contrast ratio is Mega Contrast and the best is 100000000:1.
It may also be worth also looking at one of the other LCD screens that have a 30000000:1 dynamic contrast ratio currently available including the Hannspree HL229DPB, or the Philips 221V2 which has a better Rating.
If the contrast ratio of this medium monitor is not high enough for you then you might also want to consider the Hanns.G HE225DPB (40000000:1) which also has a higher rating.