Refractive Errors

Описание к видео Refractive Errors

Myopia causes distant objects to appear blurred. Hyperopia causes close objects to appear blurred. Astigmatism can cause both close and distant objects to appear blurred. Presbyopia starts around middle age, when the eye's lens becomes less flexible and less able to focus on near objects. Learn more at http://www.geteyesmart.org.

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