There are many things that will allow someone to test heart rate:
-Pulse oximeter
-Wrist monitor
-Fitness trackers
-Heart(rate) monitor
Hope I was able to help!
Answer: Refraction Phoropter
Explanation:
Refraction (refractive power): As light enters the eye, the lens helps focus light rays so that they come to a focus on the retina. This action is called refraction.
An instrument called a phoropter detects the eye’s error of refraction.
Yes, the answer is the second choice, B.
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