The retina is brain tissue — and what happens to it predicts what will happen to your brain

The retina develops embryologically as an outgrowth of the diencephalon — the same brain region that gives rise to the hypothalamus and thalamus. Retinal neurons are technically neurons of the central nervous system, and the vasculature supplying the retina shares characteristics with the cerebral microvasculature damaged in small vessel disease. A 2020 Lancet Digital Health study used AI analysis of retinal fundus images to predict cardiovascular events with accuracy comparable to standard risk calculators, without any blood tests.

Protecting Retinal Health

• Blood pressure management — hypertensive retinopathy directly tracks with cerebrovascular disease
• Blood glucose control — diabetic retinopathy shares mechanisms with diabetic cerebrovascular disease
• Omega-3 DHA — concentrated in photoreceptor outer segments; deficiency accelerates retinal degeneration
• Lutein and zeaxanthin from dark leafy greens — macular pigments that filter damaging short-wavelength light
• Regular eye examination from age 40 — annual dilated fundus examination detects early pathological changes