There was a 2021 study published in Nature Scientific reports (Shinhmar et al.) which demonstrated the following about one-time exposures restoring vision in aging patients.

We show here that single 3 min 670 nm exposures, at much lower energies than previously used, are sufficient to significantly improve for 1 week cone mediated colour contrast thresholds (detection) in ageing populations (37–70 years) to levels associated with younger subjects.

Additionally, the results of this study are being used by a UK-based company (eye-power.co.uk) as scientific backing for their product which is promoted to “slow retinal aging”.

Figure: “eyepower red” product sold by “eyepower” as detailed on their website https://eye-power.co.uk/product/eyepower-red/

Bounty details: I'm offering 2500 RSC for information about the cellular/molecular mechanisms behind the claims to slow retinal aging.

Optional Bounty: Additionally, I will award an additional 2500 RSC for commentary on the suggested regimen of using the eyepower-red “just 3 minutes every few days” as it relates to the information found in literature.

Preprint

Preprint

How does long wavelength light exposure improve vision?

How does long wavelength light exposure improve vision?