Scientists have revealed that vCJD could be transmitted to patients by the surgical instruments used in eye surgery. A team from the Prion Unit at Imperial College School of Medicine , London, reported in the Lancet medical journal today on a new highly sensitive test to detect the particles that cause the disease. The test examines the retina and optic nerve, areas that exhibit high levels of prion proteins (PrPSc) in vCJD-infected patients.