It's clear now that the physical changes (deterioration) in the eye correlates to insufficient UV exposure. So that's a good place to start, particularly if you're young. Sunseekers live longer, too.
The eye has a range in which it can focus. Myopia is a shift of the range due to the shape of the eye, while presbyopia is a shrinking of the range due to hardening of the lens.
zero infinity
--------------|-------------|--------------
----------------| |------------- < normal focus range
----| |------------------------- < range of myope
----------------------| |------------------ < range of presbyope
From what I can tell, the sunseekers claim is based on a study[1] where people were surveyed about their sun exposure, and then mortality was examined years later. The most likely causes identified for the longer lives of those with more sun exposure was vitamin D preventing heart disease. I feel like there's more to the story, since vitamin D is also available in other forms that don't involve UV exposure.
[1] https://bottomlineinc.com/health/longevity/more-sun-longer-l...
K. A. Rose, G. Morgan, et al, Outdoor activity reduces the prevalence of myopia in children, Ophthalmology, August 2008
P. C. Wu, C.L. Tsai, Outdoor activity during class recess reduces myopia onset and progression in school children, Ophthalmology, May, 2013
https://www.cbsnews.com/news/kids-exposed-to-more-sunlight-l...
Antonio Medina, Detecting the effect of under-correcting myopia, 2015: https://www.academia.edu/29691342/Detecting_the_effect_of_un...
Peter R Greene and Antonio Medina, The Progression of Nearwork Myopia, 2016: https://www.omicsonline.org/open-access/the-progression-of-n...
http://journals.lww.com/optvissci/Abstract/2013/11000/Spheri...
Last time I checked, most myopia research didn't and sidelined it although it explains so much, I consider it an extremely underrated paper.
Scott A. Read; Michael J. Collins; Beata P. Sander, Human Optical Axial Length and Defocus, Investigative Ophthalmology & Visual Science, December 2010, http://iovs.arvojournals.org/article.aspx?articleid=2126435
Significant changes in optical axial length occurred in human subjects after 60 minutes of monocular defocus. The bidirectional optical axial length changes observed in response to defocus implied the human visual system is capable of detecting the presence and sign of defocus and altering optical axial length to move the retina toward the image plane.
Vasudevan, Ciuffreda, Ludlam. Accommodative Training to Reduce Nearwork-Induced Transient Myopia, Optometry and Vision Science: November 2009, https://journals.lww.com/optvissci/Abstract/2009/11000/Accom...
Training of the accommodative system in these progressing myopes resulted in improved dynamics in both laboratory and clinical measures. This is consistent with earlier reports in the literature of improvement in symptomatic myopic subjects.
https://www.comsol.com/blogs/calculating-the-emission-spectr...
https://glarminy.com/2016/06/15/reduce-computer-eye-strain-h...
However, I hope this is sarcasm. 30 somethings that get suckered into the sungazing myth are some of the saddest patients.
> a person who enjoys spending time outside during warm weather, especially one who travels to a destination for its warmth and sun.
> "thousands of sunseekers flocked to Britain's south coast on Sunday"