This claim is false. While high-intensity blue light can damage retinal cells in laboratory settings, the American Academy of Ophthalmology, Harvard Health, and a 2023 NIH review all state there is no evidence that blue light from smartphones causes permanent retinal damage under normal use. Studies cited in support either used unrealistic exposure intensities, animal models, or showed only statistical associations — not causation. The primary proven harms of prolonged screen use are digital eye strain and sleep disruption, not permanent retinal damage.