Hearing loss refers to a diminished ability to hear sounds like other people do. Deafness refers to the inability to understand speech through hearing even when sound is amplified. Profound deafness means the person cannot hear anything at all; they are unable to detect sound, even at the highest volume possible.Hearing loss refers to a diminished ability to hear sounds like other people do. Deafness refers to the inability to understand speech through hearing even when sound is amplified. Profound deafness means the person cannot hear anything at all; they are unable to detect sound, even at the highest volume possible.Hearing loss refers to a diminished ability to hear sounds like other people doDeafness refers to the inability to understand speech through hearing even when sound is amplified.When describing hearing loss, we generally look at three categories: Type of hearing loss: Conductive hearing loss: ( It is a state when sound cannot get through the outer and middle ear. It may be hard to hear soft sounds. Louder sounds may be muffled.)2) Sensorineural hearing loss:(It usually happens when the inner ear is damage.)3) Mixed hearing loss: (damage in the outer or middle ear and in the inner ear or nerve pathway to the brain.) The human hearing range frequencies is between 20-20000Hz and in amplitude it ranges from 0-130db. 0 dB does not means absence of sound, but it is the softest sound I.e. an average unimpaired human ear can hear. Some people can even hear down to -5 or even -10 db. 130 dB represents the threshold of pain.symptoms:pain or pressure in the earsA blocked feelingThere may also be accompanying secondary symptoms:Hyperacusis, heightened sensitivity to certain volumes and frequencies of sound .Ringing, buzzing other sounds in the ear when no external sound is present .disturbances of facial movement (indicating possible tumor or stroke) .Mild deafness or mild hearing impairment -detect sounds from between 25 to 29 (dB). Hard to understand what other people are saying, especially if there is a lot of background noise.Moderate deafness or moderate hearing impairment – between 40dB and 69dB. Following a conversation from hearing is very difficult without using a hearing aid.Severe deafness – hears sounds above 70db to 89dB. A severely deaf person must either lip-read or use sign language in order to communicate, even if they have a hearing aid.Profound deafness – cannot hear a sound below 90dB .Some cannot hear anything at all, at any level of decibels. Communication is done with sign language and/or lip-reading.Oral Deaf or Late Deafened people :People who are deaf also have little or no hearing, but they typically do not use American Sign Language as a primary language and often have no signing ability at all. They rely on lip reading and text alternatives. Smoke alarms for deaf people :Its shows light to wake the person up Vibration notification appliances, such as pillow or bed shakersDoorbell signalers:This doorbell work with or without an existing doorbell to make sure you know when someone is at the door.There are also security signalers that alert you if a door or window is opened in your home. Simply the word direct means moving from one place to another without changing in direction or stopping. Direct lighting is a type of lighting system that means the light is coming from the source directly to the surface or object.proportionally 90 percent of the light is going directly downward. Visible light source. Not great for creating cozy atmosphere in the room. Source of glare.In the dictionary the word diffuse is to scatter and spread widely.Diffused light is a soft light scattered and coming from all directions which happens because of direct light hitting a surface of passing throw a surface like glass or plastic. Free of glare. Spread and diffused evenly in the room to create cozy atmosphere.More pleasant than direct lighting.This lighting refers to applications or fixtures that direct the light upward to the ceiling to diffuse the light off the walls or the ceiling to light the room.Less glare. Comes from all sidesIn order to reduce the energy consumption of lighting system then the easiest way is to turn the lights off whenever it’s not been used .Occupancy sensors: one of the effective solutions is the Occupancy sensors, it’s function is to sense people movement in spaces where they get in and out by using infrared or ultrasonic motion sensors. its been used in offices, restrooms and conference room. Dim lights: it’s used when there is a good amount of daylight. The function basically requires brightness sensors in order to place it in a strategic place in the room.It saves around 20- 65 % of energy consumption. Deaf people are very reliant with :LightColor For a strong communication and to have a space that they will feel comfortable and relax .So for the deaf and visually centered people feels uncomfortable with harsh colors or uncomfortable coloring can cause :Eye fatigue.Feelings of indignation.The colors on walls or floors can prevent the communication when it too light or too harsh.