What cause poor eyesight?

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I know eyesight deteriorates as we grow old. Both of my parents start to have poor eyesight around 40+. We are three siblings, me being the eldest followed by two girls. I’m 27 and I’m the only one who has 20/20 vision. Both of my siblings start wearing glasses already during their teenage years due to their poor eyesight. I’m actually quite surprise because I’m the one abusing my eyes during my teenage years by exposing my eyes to long screentime e.g games. I know I’m lucky and I’m grateful for it but I’m just wondering how come they have it and I don’t.

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This video explains how laser Eye surgery works but give a good and simple explanation of what causes poor eyesight

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