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Of the three main refractive errors affecting human vision, myopia is the most common. The condition affects a significant number of people worldwide.
Since the first contact lens for vision correction was invented in the late 1800s, much has changed. The first lenses were made of glass, were heavy, and covered the whole eye surface. Later, they became smaller, lighter, and only covered the front of the eye. After that came the new softer materials that gave rise to soft contact lenses.