ST BARTHOLOMEW'S HOSPITAL / SCIENCE PHOTO LIBRARY ST BARTHOLOMEW'S HOSPITAL / SCIENCE PHOTO LIBRARY
Optician examining a man's eyes using a non-contact ophthalmotonometer, a device which measures the pressure inside the eyeball. A high intraocular pressure can cause blurring and loss of vision. The condition, which is known as glaucoma, occurs increasingly with age and is an important cause of blindness.
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