I have another theory based on observation. Do you remember when Lord Smithers demonstrated masking? He ironically explained it while yelling over the pencil sharpener. Notice how our ears can't detect things when it is being bombarded with louder sounds.
But our eyes don't necessarily follow the same concept.
For instance, I'm sitting here on my computer and the evening sun is coming in through the window next to me. My bedroom lamps (unfortunately CFL) are on on the other side of the room with a night light on down the hall in the bathroom and small lamp on in the kitchen. With all this light, you would think that I wouldn't be able to see the Num Lock light on my keyboard. Yet I can.
It's interesting that our eyes can still perceive the tiniest amount of light, even when we are in the presence of very intense light.
Of course, some limitations still apply. Like aurally, there's a certain point where the sound is so loud, you can't take any more in and quite processing the information. That's usually the point of deafness. Same with light. If your face is in the can of a PAR 1k MFL, you won't be seeing anything else.... and possible for a while thereafter.
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