Disorder known commonly as “tired sight”, it is the difficulty of reading or writing due to the process of the aging. From the 40 or 45, the crystalline, in normal conditions, starts losing flexibility, then it loses its aptitude to accommodate and focus adequately. One of the typical signs, it is the trend to remove the text when it is tried to see closely; there will come a moment in which the arms will not be it sufficiently long for it.
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