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Causes of Deafness and Hearing Loss

Deafness and Hearing Loss Overview Hearing impairment, deafness, or hearing loss refers to the total or partial inability to hear sounds. There are many causes and types of deafness. A patient with a mild hearing impairment may have problems understanding speech,...

Causes, Symptoms & Types of Vertigo

Vertigo Overview Vertigo is a sensation of spinning and dizziness. It may cause balance problems and nausea. Vertigo stems from a problem with the inner ear, brain, or sensory nerve pathway. Possible causes include labyrinthitis, pregnancy, and stroke. Dizziness,...

Causes and Types of Migraine Auras

Migraine Auras Overview Migraine auras are sensory symptoms that can occur before or during a headache. They tend to take the form of visual and physical disturbances or sensations. Migraine with aura is a type of migraine headache. Common symptoms include tunnel...

Causes and Types of Vision Loss

Vision Loss Overview Vision loss refers to either complete or partial loss of vision. Depending on the cause, vision loss may occur suddenly or gradually, and in one or both eyes. Some types of vision loss are temporary or reversible. Vision loss is relatively common....

Human Vitreous Humor Samples

Bay Biosciences provides high-quality, fresh frozen human vitreous humor samples from normal healthy donors for research.  Vitreous is a transparent substance in the eye that is around 99 percent water. The remaining one percent is collagen and hyaluronic acid, which...