A specialized optical instrument used to measure the degree and axis of astigmatism in the eye.
From astigmatism plus -meter (Greek 'measure'). This term emerged in the late 19th century as optometry developed precise instruments to quantify vision defects.
An astigmatometer is like the fingerprint scanner of the eye—it measures the exact unique shape of your cornea's irregularities to prescribe exactly the right correction for your specific vision quirks.
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