Vogt–Koyanagi–Harada disease Vogt–Koyanagi–Harada disease Vogt–Koyanagi–Harada disease (VKH), also known as Vogt–Koyanagi–Harada syndrome, uveomeningitis syndrome and uveomeningoencephalitic syndrome, is a multisystem disease of presumed autoimmune cause, that affects pigmented tissues, which have melanin. The most significant manifestation is bilateral, diffuse uveitis, which affects the eye. VKH may variably also involve the inner ear with effects on hearing, the skin, and the meninges of the central nervous system. The disease is characterised by bilateral diffuse uveitis, with pain, redness and blurring of vision. The eye symptoms may be accompanied by a varying constellation of systemic symptoms, such as auditory (tinnitus, vertigo, and hypoacusis), neurological
Tinnitus masker tinnitus sounds and background sound. More advanced software based tinnitus maskers can use a combination of natural and synthetic sounds or a filtered noise generator tailored to mask the specific frequencies at which the tinnitus signal is experienced. Some sufferers require masking at all times. These people may employ wearable hearing aids which amplify ambient sound, generate low level wide band sounds such as white noise, or combination devices that mix both functions into one device. A standard hearing aid may be used for tinnitus masking; the tuning and amplification characteristics are different than when one is used in compensation