Phoropter ophthalmic testing device
Keywords
refraction,
vector,
optometry,
vision,
eye,
test,
lens,
prescription,
exam,
optical,
correction,
clarity,
measurement,
diagnosis,
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opthalmology,
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astigmatism,
sharpened,
sphere,
cylinder,
axis,
dioptre,
health care,
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technology,
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alignment,
assessment,
precision,
eyesight,
apparatus,
doctor,
exam,
frame,
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near,
distance,
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instrument,
calibration,
medicals,
research,
ring,
spectacle