Exam Preview

On Ear Verification of Open Fittings

---

1.  What are the advantages of an open fitting? Increased available gain compared to a closed fitting Addresses occlusion and own voice complaints Good for flat hearing losses Provides an electronic sound quality

2.  Define an open fitting: All RIC hearing instruments All thin tube hearing instruments Any hearing instrument that does not occlude the ear when worn All BTE hearing instruments

3.  What are the recommended methods for confirming an open fitting? REUR/REOR and insertion gain measures Occlusion effect test and insertion gain Insertion Gain and Speechmapping REUR/REOR and Occlusion Effect Test

4.  What were the three acoustic considerations regarding open fittings that were described? Venting, ear canal resonance, acoustic pathways Ear canal resonance, pinna effect, venting Venting, pinna effect, gender Gender, venting, acoustic pathways

5.  Which of the following statements are true regarding verification of open fittings? Test box verification is best practices and concurrent equalization should be used to avoid error. Only on-ear verification is possible, and a stored equalization procedure (rather than a concurrent equalization procedure) must be used to avoid error. Test box verification is not possible, and concurrent equalization should be used to avoid error. Test box verification is best practices, and a stored equalization procedure should be used to avoid error.

6.  Which of the following methods can be used to verify open fittings in the test box? 2 cc coupler method .4 cc coupler method Substitution method None of the above as open fittings cannot be verified in the test box

7.  When verifying an open fitting on ear, concurrent equalization: is a good timesaving option prolongs the test time but contributes to an accurate fitting may cause error as the equalization measurement could be contaminated by amplified sound leaking out of the ear canal during the measurement should be conducted with the hearing aid muted

8.  Venting is an important acoustic consideration in hearing aid fittings. Compared to an unvented condition, an open fitting provides approximately how much less gain at 1000 Hz? 30 dB 20 dB 10 dB 2 dB

9.  What two factors must be considered when conducting an on-ear directional mic test? Mic port orientation and directional mic symmetry Mic port orientation and venting Venting and directional mic symmetry None of the above

10.  Noise reduction effects can be measured: in open fittings and closed fittings in open fittings, but not in closed fittings in closed fittings, but not in open fittings in neither closed fittings nor open fittings