Credit: American Journal of Ophthalmology (2025). DOI: 10.1016/j.ajo.2025.06.009 Since the dawn of human spaceflight, scientists have carefully studied the effects of space and microgravity on astronauts. After decades of observations and examinations, one truth is certain: space is brutal on the human body. Muscles atrophy, bones lose mass, limbs stretch and—more unknown—eyesight can degrade in ways not yet fully understood. To better understand the loss