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Comment by Alex3917 | Hacker News Reader

As a reminder, you can use the D Minder Pro app to estimate your daily vitamin D intake from sun exposure. It was free during the first year of the pandemic, right now it costs $1.99.

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The Apple Watch (or any other smart watch) should have a built-in sun measuring sensor, noting when people have not enough sun exposure to produce the necessary amount of Vitamin D to be healthy. Once AR is there, they could make a game out of it, showing progress bars at the peripery of the eyes. This could make reaching the targets much easier for a lot more people.

That sounds like a good way to get sued over someone’s melanoma.

Easily preventable with a 100 page ToS to agree to before allowing usage!

Wristwatches are often covered by sleeves.

How much sun does that block? Workarounds may be feasible, depending on the mechanism.

The thickness and color of the cloth would affect how strong the SPF is for any given shirt.

That's fine. As long as the sensor is available the user can expose it. I think this is a pretty cool idea, and would yield more accurate measurements than estimating based off of latitude and cloud coverage alone. Albeit it'll all but guarantee tan lines.

> Once AR is there, they could make a game out of it, showing progress bars at the peripery of the eyes.

Are you good?

GPS is sufficient.

I use "UVIMate" app to provide a general ballpark figure on how much time I should spend under the sun:

https://play.google.com/store/apps/details?id=au.com.aershov...

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