In old age, people have to wear spectacles for reading and writing because 1.their eye lenses become weak. 2.they lose the power of accommodation. 3.their eye-lenses lose their magnifying power. Which of the above is/are correct?

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In old age, people have to wear spectacles for reading and writing because 1.their eye lenses become weak. 2.they lose the power of accommodation. 3.their eye-lenses lose their magnifying power. Which of the above is/are correct?

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