Why Testing Your Vitamin D Can Safeguard Your Sight

We explain why vitamin D3 matters for eye health, where research points across dry eye, glaucoma, macular degeneration, diabetic retinopathy, and cataracts, and how to make smart, test-guided choices. We share target intake ranges, personal practices, and a simple plan: don’t guess, test. • vitamin D3 as a hormone shaping inflammation, immunity and oxidative stress • widespread deficiency due to limited sun, diet and indoor life • target serum 25(OH)D levels and common intake ranges for seni...