An instrument for testing the refractive power of the eye.
More example sentences
- He immediately became hypermetropic (long sighted) in that eye, but using his optometer found ‘the same inequality in the horizontal and vertical refractions as without the water’.
- We have developed an optometer to measure the ocular astigmatism of human eyes and tested its performance.
mid 18th century: from Greek optos 'seen' + -meter.
Definition of optometer in:
- The US English dictionary