Mr. Duffy is admitted to the CCU with a diagnosis of R/O MI. He presented in the ER with a typical description of pain associated with an MI, and is now cold and clammy, pale and dyspneic. He has an IV of D5W running, and is complaining of chest pain. Oxygen therapy has not been started, and he is not on the monitor. He is frightened. Q. You also explain common eye changes associated with aging. One of these is presbyopia, which is: