Lisa+Legrand



Ever wonder why your pupils sometimes change size?

The most common reason pupils changes size is from changes in light, but it can be from a few things, changes in light, emotions, or the effect of drugs. Bright light shines on the eye, causing muscles in the iris to retract and reduce pupil size. As the pupil gets smaller, it protects the eye from damage due to the bright light. With less than average light, pupils dialate, enableing the eye to catch more light and sustain normal vision.  contracted pupils form too much light

Light causing pupils to dialate  if pupils could take over your eye

the effects of heroin "pinhead eyes"

info from: -everydayhealth.com/eyehealth -ask.com/wiki/pupil