Laboratory vs. Real-World Performance of Directional Microphone Hearing Aids
Dr. Brian Walden, Ms. Rauna Surr, and Ms. Mary Cord; DAC
The authors will present information based on patient questionnaires regarding the use and effectiveness of dual microphone hearing aids.
Custom-Fit vs. Disposable Hearing Aids for Patients With High Frequency Hearing Loss
Dr. Therese Walden, DAC
This study compared the real-ear response provided by custom-fit hearing aids to the closest matching fixed-format disposable hearing aids (DHA) in patients with precipitous high-frequency hearing loss. Laboratory and field measures of aided performance were obtained to compare patient performance with the custom-fit and fixed-format hearing aids. In addition, coupler versus real-ear response differences were compared for the two hearing aid types. Results revealed that relatively close approximations to the real-aided responses of the custom-fit instruments were possible for most subjects using only seven fixed acoustical formats. The differences that existed in the aided responses between the two instrument types did not result in significant differences for aided speech recognition, nor for field ratings of aided performance, although patient satisfaction was rated lower for the DHA. Additionally, the real-ear to coupler difference was greater for the disposable hearing aid, presumably due to its deeper insertion into the ear canal.
Auditory Effects of Anti-Tank Weapon Fire Without Hearing Protection–Clinical Case Study
COL Nancy Vause, USA
Hearing faint warning signals can prevent injury in many work environments. However, maintaining normal hearing is more difficult for soldiers whose acoustic environment is one of extremes. For example, a quiet jungle trail can suddenly erupt with impulse noise exceeding 180 dBP. This paper presents a complete analysis of the specific aspects of a one time exposure (without hearing protection) in regard to type of exposure, spectral waveform, hearing protection and audiometric results.
Navy Presentations
The Epidemiology of Hearing Loss in the US Navy
CAPT Bruce Bohnker, USN
This presentation will begin with a basic introduction and background of the Navy’s Hearing Conservation Program. It will look at the study design, data collection and analysis of the Epidemiology of Hearing Loss in the U.S. Navy personnel: 19951–999. Focus will be on the epidemiology of hearing loss, changes in enlisted and officer personnel and compare this to historical data. Discussion and implications for Hearing Conservation Programs will also be discussed.
Hearing Health in a Population of Flight Deck Personnel
CDR Glen Rovig, USN
This presentation will provide a brief description regarding noise levels associated with flight deck work. Case studies will be presented that will provide a population description, methodology, risk factors, results and conclusions.
Air Force Presentations
Hearing Conservation Testing, Follow-up and Referral
Lt Col Theresa Schulz, USAF
Brooks AFB, TX
This presentation will begin with a short discussion on audiometric testing. It will focus on testing issues and explain why audiometric testing is a critical part of a Hearing Conservation Program. The follow-up process will be discussed to include what, why, when and how. In conclusion, the referral criteria and process will be explained.
Medical Support in Operations Other Than War and Humanitarian Assistance
Lt Col Ann Stokes, USAF
Keesler AFB, MS
This presentation will begin with a discussion on political objectives, levels of conflict and roles of the medical staff in operations other than war (OOTW) and humanitarian assistance. It will identify potential threats, requirements for international coordination and the logistics involved in such operations.
Attenuating Custom Communication Earpiece System
Capt John Hall, USAF
Wright-Patterson AFB, OH
This presentation will start off with a definition of the problem. It will discuss F-119 engine noise, personnel exposure and communications deficiency. In addition, it will address the AFRL prototype (custom communication earphone) to include the F-22 field demonstration at Edwards AFB and the laboratory metrics at Wright Patterson AFB. It will conclude with a discussion on legacy aircraft applications and current project status.