The traversal of runtime spanning trees is facilitated in a distributed operational environment. The image processing method includes determining an entrance exposure of an object, determining an exit exposure of the object, and determining one or more image processing parameters based at least in part on the entrance and exit exposures. The disease states or maladies include but are not limited to Alzheimer’s Disease, familial Alzheimer’s Disease, Down’s Syndrome and homozygotes for the apolipoprotein E4 allele. The measured activitycharacteristics can then be used in providing related information to a user of the eyewear. In one particular form the spring has a shorter leaf with an end portion extending over the axle with an air spring mounted either directly over the axle or on one side of the axle.