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WordNet-Online
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Definitions from the WebTypes of NystagmusDescription:Nystagmus is an involuntary eye movement condition that causes repetitive and uncontrolled oscillations of the eyes, which can result in impaired vision and a lack of visual stability. There are several types of nystagmus, each with its own distinct characteristics and causes. Senses/Usages:1. Congenital Nystagmus (noun)This type of nystagmus is present from birth or develops within the first few months of life. It is often hereditary and can be associated with certain medical conditions or neurological disorders. Example sentence: My nephew has congenital nystagmus, which means his eyes constantly move from side to side. 2. Acquired Nystagmus (noun)Acquired nystagmus refers to the development of the condition later in life, usually due to an underlying medical condition, brain injury, medication side effects, or alcohol and drug abuse. Example sentence: The patient's acquired nystagmus was caused by a head injury sustained in a car accident. 3. Vestibular Nystagmus (noun)Vestibular nystagmus occurs as a result of a dysfunction in the inner ear's vestibular system, which is responsible for maintaining balance and spatial orientation. This type of nystagmus is usually triggered by specific movements or positional changes. Example sentence: The athlete experienced a brief episode of vestibular nystagmus after completing a series of somersaults. 4. Optokinetic Nystagmus (noun)Optokinetic nystagmus is a physiological response of the eyes to visual stimuli when there is consistent motion across the visual field. It can be induced by objects passing rapidly in front of the eyes or by watching a moving pattern, such as rotating stripes. Example sentence: The optokinetic nystagmus test helps assess the health of a person's visual system. 5. Pendular Nystagmus (noun)Pendular nystagmus is characterized by equal-speed eye movements in both directions. The eyes exhibit smooth oscillations, resembling a pendulum swinging back and forth. Example sentence: The ophthalmologist noted the presence of pendular nystagmus during the eye examination. 6. Spasmus Nutans (noun)Spasmus nutans is a type of nystagmus that typically affects infants and toddlers. It involves rapid, irregular eye movements along with an atypical head nodding or tilting, often resolving spontaneously by the age of three. Example sentence: The pediatrician reassured the worried parents that their child's spasmus nutans would likely improve over time. 7. Gaze-Evoked Nystagmus (noun)Gaze-evoked nystagmus refers to the occurrence of nystagmus when the eyes deviate from a straight-ahead position. This type of nystagmus may indicate a problem with the brainstem or cerebellum. Example sentence: The neurologist observed gaze-evoked nystagmus when the patient looked to the far left, suggesting a neurological disorder. 8. Downbeat Nystagmus (noun)Downbeat nystagmus is characterized by the eyes drifting slowly downward and quickly resetting in an upward direction. It usually indicates dysfunction in the cerebellum or the brainstem's lower regions. Example sentence: The ophthalmologist diagnosed the patient with downbeat nystagmus after conducting various diagnostic tests. 9. Upbeat Nystagmus (noun)Upbeat nystagmus involves slow upward drifts of the eyes and rapid resetting downward. It is often associated with structural abnormalities in the brainstem. Example sentence: The patient's upbeat nystagmus indicated a potential neurological issue, requiring further investigation. Related Products:To learn more about nystagmus and its treatments, you may find the following books and products useful: | ||||
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