Historical indentation tonometer

Historical indentation tonometer

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Credit: MARK THOMAS/SCIENCE PHOTO LIBRARY

Caption: Historical indentation tonometer. This device was used by William MacLean in around 1918. It is used to measure the intra ocular pressure - the pressure inside a person's eyeball. This is used to help in the diagnosis and evaluation of a number of eye problems including glaucoma. Photographed at the Royal College of Ophthalmologists, London, UK.

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