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28-Aug-2017 23:20

For instance, we might need to focus on the moon (infinity), our computer (intermediate, or about 60 cm) or a book (near, or about 40 cm).

The ability of the crystalline lens to instantly change shape in order to focus light rays on the retina for near vision tasks gradually declines throughout life.“The way American men look and act, they seem very friendly and like they will be good partners because they are easy going.