Medications can also cause your pupils to dilate and influence their response to light, as certain medicines interfere with communication between your brain and your iris muscles.
For example, researchers in one landmark presented two pictures of the same woman to male participants and asked them to describe her.
Further experiments showed that the effect of pupil constriction to attractiveness judgment extended to intrinsically esthetic visual objects such as natural scene images as well as faces but not to line-drawing geometric figures.
Dilated pupils are perceived as more feminine than undilated pupils.
This means dilation is just like the butterflies in your tummy when you are nervous or the sweaty palms some people get in similar situations.
They say the eyes are the windows to the soul and can reveal your true feelings about others.