Visual accommodation plays a critical role in ones visual perception and activities of daily living. The age-related accommodation loss poses a greater risk to older adults safety and independence. Although extensive effort has been made to study the effects of aging on accommodation, the relationship between aging and the dynamic aspects of accommodation is still unknown. Furthermore, since light is the carrier of external stimuli for accommodation, it is of value to assess the influences of light on the age-related accommodation loss. Therefore, a study was conducted to ...