Written in the eye: How the retina's biological age could help predict osteoporosis risk https://www.sciencealert.com/your-eyes-could-reveal-your-risk-of-osteoporosis-study-finds The biological age of the retina correlates with bone mineral density and the fracture risk score and predicts the onset of osteoporosis https://journals.plos.org/digitalhealth/article?id=10.1371/journal.pdig.0001360