Hi Liz,
This panic related symptom is tied into the 'Flight or Fight' phenomena.
It readies us for dealing with dangerous situations...even though none is present...our anxiety and bodies still react.
Here is a good explanation from an article that explains more.
Unreality or bright vision - When responding to danger, our pupils dilate to let in more light and to make sure that we can see clearly enough. This reaction makes our environment look brighter or fuzzier, and sometimes less real.
Use your stress relieving exercises tonight to lower your anxiety levels.
Feel better soon!
S.C.