7.1.1 - refraction

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4 Terms

1
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When would you use pinhole and what does the result tell us?

When VA is worse than expected

  • tells us if there is Rx error/uncorrected prescription or if there is pathology that makes it worse

  • If VA worse with PH likely due to cataract or Macula issue

2
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What is near fixation retinoscopy?

  • Evaluates accommodation not Rx error

    • Acc lag or Acc lead

  • Px focusses on near target

  • Normal lag is between +0.25 - +0.75D

3
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Duochrome

  • Ok to be on green before JCC

4
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AGE 50

ADD 1.50