When bright eyes go dull with stress, they do so by squeezing muscles around them.
All emotion faces are the ones that, with other things along, have squeezed their eyes from this side or that.
When eyes are not squeezed even at a single point all around them, they open full up and down in their total width.
When people try to force open their eyes more, they do not do so in their total width.
It's a very subtle phenomenon to sense.
How do we define width?
OK, we'll explain it like this: A slight smile (not very broad) on the lips locks eyes in their width.
Open them full now.
Generally when people open eyes up and down more, they do so with squeezing their lips a little. That's why they never open in their total width.
Or else when they smile, they tend to open their eyes less.
As the smile broadens, the more slit-like go the eyes.
Check it for your own self in front of a mirror.
Opening eyes with different widths and shapes of lips fills them up with the expressions of various different emotions.
It's a good game to play in front of your mirror.
What stress does is that it fixes your squeezed eyes and lips in a particular kind of theirs, thus rigidifying them in one particular emotion or else in a combination of these; turning them into emotion faces with no bright eyes on them.
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