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Silica (the chemical compound SiO 2 ) is a common fundamental constituent of glass. In nature, vitrification of quartz occurs when lightning strikes sand , forming hollow, branching rootlike structures called fulgurite .
The number of Americans who are nearsighted has doubled since the 1970s and almost 3/4 of the US population wears glasses. People are more likely to need glasses the older they get with 93% of people between the age of 65-75 wearing corrective lenses.