A continuous glow would not matter much at all in decent lighting, though it could matter in very dark situations.
Our eye doesn't actually see exactly what, say, a CMOS camera might see. We have all sorts of interesting processing built right into our eyes and brain. One of these is lateral inhibition. If one part of the retina is firing, it suppresses nearby areas, thus at the optic nerve level, we see something resembling the edges of the scene. This is converted into what we think we see later in the vision process. If you had a uniform glow, this would rapidly get tuned out, and the person would see just fine.
The one place I don't think this would work is at night. At night, our eyes undergo changes known as the Purkinje effect. This change to night vision does things such as shifting our vision away from the cones and into the rods. The rods rely on a chemical known as rhodopsin, which is maintained in an incredibly intricate balance such that a rod can be triggered by a mere 5 photons! However, to do this, the system has to go through a very long calibration phase, about 45 minutes, where it tunes all of the rods which were overstimulated during the day. (This is why, when someone shines a light on you at night, you are blinded for a quite a long period. You wreck the delicate balance in the rods, and they have to calibrate again). In low light, that glow would generate far far more photons than the rest of the scene, and would make for a much harder calibration.