With these lenses he could read manuscripts penned in very faint letters, which even I had some trouble deciphering. He explained to me that, when a man had passed the middle point of his life, even if his sight had always been excellent, the eye hardened and the pupil became recalcitrant, so that many learned men had virtually died, as far as reading and writing were concerned, after their fiftieth summer. A grave misfortune for men who could have given the best fruits of their intellect for many more years. So the Lord was to be praised since someone had devised and constructed this
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