The optometrist, by etymology, measures vision – the term is built on opsis, optikos, view, vision, plus metron, measurement.
Metron is the root in many other words:
1. Thermometer – an instrument to measure heat (Greek therme, heat).
2. Barometer – an instrument to measure atmospheric pressure (Greek baros, weight).
3. Sphygmomanometer – a device for measuring blood pressure (Greek sphygmos, pulse).
4. Metric system – a decimal system of weights and measures.
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