LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY
MODEL RELEASED. Ophthalmic blood pressure test. Nurse using a sphygmomanometer to measure a patient's blood pressure. An inflatable cuff has been placed around the patient's upper arm, and the digital device (lower centre) records the pressure in the cuff. The cuff is inflated until it cuts off the blood flow, and is then slowly deflated. When pulsing blood flow resumes, the reading is showing systolic pressure. When smooth blood flow resumes, the reading is of dystolic pressure. High blood pressure (hypertension) is a risk factor for damage to the blood vessels in the retina, and can lead to impaired eyesight. Photographed at the Princess Alexandra Eye Pavilion, Edinburgh, Scotland.
Model release available. Property release not required.