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Name 4 instruments of devices that may be used during refraction

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User MeLight
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Answer: retinoscope, refractor (phoropter), trial lens set and trial frame, cross cylinder

Explanation: 4 instruments of devices that may be used during refraction are retinoscope, refractor (phoropter), trial lens set and trial frame, and cross cylinder

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User Gareth Charnock
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