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The audiogram at the right shows normal hearing across the top using X and O. (See Legend Below Audiogram) The blue shaded areas show where the symbols would be charted in degrees of hearing loss from slight to moderate. Mild flat losses are recognized by feeling all sounds are dimmer that they used to be. Mild flat loss sufferers tend to listen to the TV or radio at higher volume than others do, finding that it is relaxing to have sounds turned up enough so they aren't straining to hear.
Moderate Loss
People with moderate loss know they have hearing loss and it interferes with normal day to day activities if not corrected by wearing hearing aids. Moderate loss requires strong, well fitted hearing aids.
Mild High Frequency Loss
As shown in the audiogram to the right most of the Xs and Os indicate normal hearing until, in the higher frequencies on the right side of the chart, the symbols fall to reflect mild high frequency loss. The high frequency portion of the group of sounds that make up a word may be inaudible to people with high frequency loss. Hearing speech is as easy but understanding becomes more difficult as the loss deepens. Traditionally High Frequency Loss has been one of the hardest to attain satisfactory improvement in hearing with hearing aids. ReSound changed that in 2003 when they came out with the ReSound AIR 60+. It's design reduced feedback and used an open earmold, overcoming the two major hurdles of high frequency loss - occlusion and feedback. Since then, most of the other hearing aid manufactures have followed in Resounds footsteps and released similar technologies.
Moderate to Severe High Frequency Loss
Commonly associated with noise damage, as well as aging, high frequency loss is common. High frequency hearing loss, as shown in the audiogram above, has benefited from vast improvements in hearing aid technology recently. High frequency loss is best treated by open ear hearing aids. Symptoms of high frequency loss are: not being able to understand speech except in quite environments, having trouble hearing TV and movies, or not being able to keep pace in conversations held in places with excessive noise such as busy restaurants or social gatherings.
Severe Loss
People suffering of severe losses have fewer choices in hearing aids. A good physical fit is critical, hearing aids must fit very snugly to hold the sound in the ear canal but not so tight that it makes the ear or ear canal sore. Traditional BTEs are the products that work best and give the least amount of trouble