ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Intraocular pressure eye test. This test uses a short sharp jet of air on the eyeball (from the conical projection at left) to measure the intraocular pressure. The technique is known as tonometry. The effect of the air jet is observed, allowing an ophthalmologist to make an assessment. This is one of the tests for glaucoma, a build-up of pressure inside the eye causing blurring and blindness.
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