Maybe you're reading more that you used to. This can, over time, make your eyes accustomed to looking at a close distance, causing short-sightedness. To overcome this, take regular breaks and look into the distance for a few minutes, while maybe making tea, coffee or chocolate. This will help slow down eyesight deterioration. It can happen at any age (started with me at 16 when studying for O levels.)
After the age of 40, many people get both long and short sighted. Somehow instructions seem printed in a smaller font!
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