Thanks for posting that.
Most of the studies that have evaluated the ocular risks of handheld displays have been done in children, which makes sense, since any adverse consequences will be felt over a longer period. If you read the meta-analyses, the associations are not firm, and it's unclear whether the effect is due to kids spending less time outdoors. Regardless of the display type, though, it's generally agreed that use should be limited for a variety of reasons not limited to eye health.
Extrapolating this to headsets like the Apple Vision Pro isn't a given. So far, there's no evidence that they're worse in this regard. Still, avoiding prolonged use is wise, especially in children. Even in adults, taking breaks and blinking often to avoid dry eyes is recommended.