obviously the human eye can’t zoom, but it can focus and take in a wide range of amounts of light. when using a camera lens, if you take a picture of, say, the moon, with an ISO that is too high, you’ll miss all of the craters and other detail. However, looking at the same moon with the naked eye, you can make out a lot of those details. is an eye just, like, a camera on auto? hopefully i’m being clear enough.
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The eye will adjust its focus and exposure automatically. You won’t typically notice this, although or course you can see the dilation of your pupils in the mirror and with practice you can control focus manually.
With dilation you may be able to notice it from time to time if you pay close attention. My eyes are frequently dilated differently and when the difference is extreme they will just ‘feel’ different.
There’s a lot going on in your eyes that you probably don’t realize. Like the other poster pointed out your pupil is adjusting to let the right amount of light in. There’s also a muscle attached to the end that is constantly contracting and stretching the lens in your eye to make it more or less round, which allows you to focus. You can tell if you focus on your finger or something really close to your face and then look away – it will actually be blurry for a second before the distant image comes into focus because it takes a second for the muscle to relax. Your brain is like the software of the camera that controls adapting all of those things on auto in a camera, but much much better.
To answer your question specifically about the exposure triangle – probably the best analogy is that your pupil size is like the aperture, the sensitivity of rods and cones in your eyes is like the ISO (except your brain adjusts it all for you), and exposure is a bit more difficult. It’s more like a video camera, but generally we think your eye sees around 60 fps. That would be how fast the brain is able to process and make sense of the images you’re seeing.
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