di·op·tom·e·ter 
(dī′ŏp-tŏmĭ-tər)
(dī′ŏp-tŏmĭ-tər)n.
An instrument that is used for measuring ocular refraction.
[DI(A)- + OPT(IC) + -METER.]
di′op·tome·try n.
- Massenet
- masseter
- masseteric
- masseur
- masseuse
- mass extinction
- mass hysteria
- massicot
- massif
- Massif Central
- massive
- massively
- massiveness
- massless
- mass-market
- mass medium
- mass murder
- mass murderer
- mass noun
- mass number
- mass-produce
- mass production
- mass psychogenic illness
- mass sociogenic illness
- mass spectrograph