If the water is slightly cloudy, you'll notice it more from the sides than the front, obviously.
But think about those massive aquariums where you walk through underground tunnels etc, ridiculously bigger than our fish tanks, and yet you can usually see through them very clearly.
I'm not saying there's anything particularly wrong or dangerous going on with your tank if the visibility isn't perfect, the fish won't care after all. But neither should you dismiss it as being one of those things, as it *is* possible to have perfectly clear water from every angle.
135 litre (35 US gallons) 6 Black Widow Tetra; 3 Mollies; 3 Bronze Cory; 1 Pygmy Cory; 6 Gold Barbs
27 litre (7 US gallons) 6 Guppies.