Near-sightedness, far-sightedness, astigmatism, and presbyopia are the four most common types of what type of 'R' error related to focusing light and retina shape?

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Considering all the tissues and cells in your body, 25 million new cells are being produced each second.


1. Near-sightedness, far-sightedness, astigmatism, and presbyopia are the four most common types of what type of 'R' error related to focusing light and retina shape?