People with so-called " resting squint face " may seem like they are perpetually angry, but they may just be having trouble seeing. Focusing on close objects becomes increasingly difficult as people age, making it hard for some to read a menu or book — or to see a computer screen.

Age-related farsightedness, called presbyopia , usually starts when people are in their 40s, when the lens in the eye starts to become more rigid, and continues until age 65, according to the National Eye Institute. The usual solution is reading glasses. About 1 in 3 Americans, or 36%, wear them, according to The Vision Council . MORE: Why are more older people dying after falls?

But a new study presented Sunday to the European Society of Cataract and Refractive Surgeons found that specially-formula

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