Chapped, dry hands and rough, patchy elbows are two signs that you're not as young as you used to be. But most of us don't think much about how aging--not to mention the desiccating effects of wintry winds and overheating--also dries out the thin film of tears that bathes and protects our eyes. For 10 million Americans, the problem is bad enough that they suffer from something called dry-eye syndrome. Their eyes become dry and itchy or, at the other extreme, produce excessive quantities of tears. Their vision may get blurry, or they may find they can't leave their contacts in...
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