A hearing aid is an electro acoustic body-worn apparatus which typically fits in or behind the wearer’s ear, and is designed to amplify and modulate sounds for the wearer.
It makes some sounds louder so that a person with hearing loss can listen, communicate, and participate more fully in daily activities. A hearing aid can help people hear more in both quiet and noisy situations. However, only about one out of five people who would benefit from a hearing aid actually uses one.The hearing aid receives sound through a microphone, which converts the sound waves to electrical signals and sends them to an amplifier. The amplifier increases the power of the signals and then sends them to the ear through a speaker.
Analogue hearing aid directly converts sound waves to electrical waves.
Do not distinguish different sounds and therefore amplify all sounds equally, which means some sounds, are too loud while others may be difficult to hear. This is rectified when the hearing aid user adjusts the volume
Sound quality has to be compromised and lot of manual work is required.
Phototherapy, or light therapy, is the administration of doses of bright light in order to normalize the body‘s internal clock and/or relieve depression.
Phototherapy is generally administered at home. The most commonly used phototherapy equipment is a portable lighting device known as a light box. The box may be mounted upright to a wall, or slanted downwards towards a table. The patient sits in front of the box for a prescribed period of time (anywhere from 15 minutes to several hours).