As we age our eyes change.  Our pupils become more fixed so the amount of light entering our eyes is less.  The lens becomes yellowed so we don’t perceive colors as well.  At 60 our eyes require 2 times as much lighting to see and perform tasks as we did at 30.  Most lighting systems are designed with a 30 year old user in mind.  For performance, productivity and safety, lighting needs to be considered as we age.