what do mean by contact lenses ? Write your answer in 150 to 200 words.
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Contact lens, or simply contacts, are thin lensesplaced directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide,[1] and they can be worn to correct vision or for cosmetic or therapeutic reasons.[2] In 2010, the worldwide market for contact lenses was estimated at $6.1 billion, while the US soft lens market was estimated at $2.1 billion.[3]Multiple analysts estimated that the global market for contact lenses would reach $11.7 billion by 2015.[3]As of 2010, the average age of contact lens wearers globally was 31 years old, and two-thirds of wearers were female.[4]
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