Abstract:
VISION In addition to presbyopia (farsightedness), late adulthood can bring other vision
defects due to body changes. For example, blood flow to the eye decreases (perhaps as a side
effect of atherosclerosis), which results in an enlarged “blind spot” on the retina and thus a
reduced field of vision.
Description:
Another theory of aging focuses
on the cells’ ability to repair breaks in DNA. Breaks in DNA strands are common events,
resulting from unknown metabolic processes. Because the organism is apparently unable to
repair all the damage, the theory proposes, the accumulation of unrepaired breaks results over
