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Don't Yell: It makes comprehension worse
Low Tech Strategies such as moving closer, communication cards, writing, changing the words to have less S, C, T, P in them, using alpha terms to spell, such as alpha for a, poppa for p, or tango for t will help make communication better. It will also convey your willingness and caring to make sure your charge doesn't feel isolated or ignored. Or even worse, a frustration.
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New Technology Has Benefits & Rishs
Hearing aids now provide many options besides just making sounds louder. They connect directly to Phones, computers and to mini mics to provides less distortion of the those soft consonants.
Some people can get buy with an OTC hearing aid, *not a personal amplifier) without need of prescription or high cost.
People who are also have vision loss, need to be aware that in order to make speech more clear, the hearing aid will block environment sounds like a tire crunch on pavement, door click, even horns, etc. which means outdoor dangerous travel or unaware of movement of people/pets in the house. This can be handled with a program specifically setup for including environmental sounds, though still capping the super loud sounds for comfort.
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Hearing Aids now have AI!
Many hearing aids can provide step counter, fall notification, lack of use, and much more. Most of these can be turn off and on, in the associated apps.
Different brands have more or less features, and ability to "automatically" resent the settings. The most important thing is to go back, to where you purchased, and work on the aids until they are very helpful.