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Nystagmus as seen in a case of ocular albinism. The cause of pathological nystagmus may be congenital, idiopathic, or secondary to a pre-existing neurological disorder.It also may be induced temporarily by disorientation (such as on roller coaster rides or when a person has been spinning in circles) or by some drugs (alcohol, lidocaine, and other central nervous system depressants, inhalant ...
Notably, hippos in antiquity referred to involuntary eye movements which are nowadays called nystagmus. [4] It is particularly noticeable when pupil function is tested with a light, [2] but is independent of eye movements or changes in illumination. [1] It is usually normal, however pathological hippus can occur. [2] [3]
Blepharospasm is aggravated by fatigue, stress, and environmental factors such as wind or air pollution. [21] Although blepharospasm is defined as a bilaterally symmetric disorder that affects both eyes, some research has reported unilateral onset. [11] [22]
When your right eye is twitching, it could be due to stress, fatigue or even dry eyes. Unless there's an underlying medical condition, eye twitches tend to come and go like the wind.
Motor tics are movement-based tics affecting discrete muscle groups. [4]Phonic tics are involuntary sounds produced by moving air through the nose, mouth, or throat. They may be alternately referred to as verbal tics or vocal tics, but most diagnosticians prefer the term phonic tics to reflect the notion that the vocal cords are not involved in all tics that produce sound.
Eye strain, also known as asthenopia (from astheno- 'loss of strength' and -opia 'relating to the eyes'), is a common eye condition that manifests through non-specific symptoms such as fatigue, pain in or around the eyes, blurred vision, headache, and occasional double vision. [1]
Rapid eye movement sleep (REM sleep or REMS) is a unique phase of sleep in mammals (including humans) and birds, characterized by random rapid movement of the eyes, accompanied by low muscle tone throughout the body, and the propensity of the sleeper to dream vividly. The core body and brain temperatures increase during REM sleep and skin ...
But so little it was, so silvery warm—a pin's-head of light! It was as if it quivered, but really this was the telescope vibrating with the activity of the clockwork that kept the planet in view. As I watched, the planet seemed to grow larger and smaller and to advance and recede, but that was simply that my eye was tired.