The blood–retinal barrier, or the BRB, is part of the blood–ocular barrier that consists of cells that are joined tightly together to prevent certain substances from entering the tissue of the retina.
Retinal blood vessels that are similar to cerebral blood vessels maintain the inner blood-ocular barrier.
The retinal pigment epithelium maintains the outer blood–retinal barrier.
The barrier becomes more leaky in patients with diabetic retinopathy.
- Blood–air barrier – Membrane separating alveolar air from blood in lung capillaries
- Blood–brain barrier – Semipermeable capillary border that allows selective passage of blood constituents into the brain
- Blood–ocular barrier – A physical barrier between the local blood vessels and most parts of the eye itself
- Blood–testis barrier – A physical barrier between the blood vessels and the seminiferous tubules of the animal testes
- Blood–thymus barrier – A barrier formed by the continuous blood capillaries in the thymic cortex
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