Eye Opening Quiz What is the lifespan of the average eyelash?*5 months2 months1 year9 monthsWhat percentage of your brain’s function is spent on seeing?*10%20%30%50%How many time do you blink in a minute?*5-10 times10-15 times15-20 times25-30 timesWhat is the most active muscle in your body?*HeartEyesTongueGluteus MaximusWhat color can humans see the most shades of?*BlueGreenRedYellowWhat is the most common eye color?BlueHazelBrownGreenNameThis field is for validation purposes and should be left unchanged.