Ophthalmic blood pressure test

Ophthalmic blood pressure test

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Credit: LEWIS HOUGHTON/SCIENCE PHOTO LIBRARY

Caption: MODEL RELEASED. Ophthalmic blood pressure test. Sphygmomanometer being used to measure a patient's blood pressure. An inflatable cuff has been placed around the patient's upper arm, and the digital device (upper left) 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. Here, the reading is 155/75 millimetres of mercury, which is higher than normal. 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.

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