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Comment by tarentel | Hacker News Reader

What's the reasoning behind being over 40? I recently complained to my optometrist that I was having a harder time seeing things up close and he prescribed me weaker lenses for work/reading. My regular prescription is right around -7 in both eyes. I'm not over 40.

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Presbyopia - the lens in our eyes begin to harden at age 40, making it harder for our eye muscles to "squeeze" the lens to focus. Presents itself as blurriness and eye strain. We usually encounter a change in our Rx during this time too, sometimes needing a weaker Rx (counterintuitively).

Would love to chat about your experience in any case. I'm at jbornhorst [at] gmail.com if interested.

Most people get this after 40. Some people get it earlier.

Presbyopia: https://www.mayoclinic.org/diseases-conditions/presbyopia/sy...

  Presbyopia usually becomes noticeable in your early to mid-40s and continues to worsen until around age 65.

If you're much younger than 40, maybe google "early onset presbyopia".

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