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Nystagmus. Nystagmus is a condition of involuntary (or voluntary, in some cases) [1] eye movement. [2] People can be born with it but more commonly acquire it in infancy or later in life. In many cases it may result in reduced or limited vision. [3] In normal eyesight, while the head rotates about an axis, distant visual images are sustained by ...
Saccade. A saccade (/ səˈkɑːd / sə-KAHD; French: [sakad]; French for 'jerk') is a quick, simultaneous movement of both eyes between two or more phases of fixation in the same direction. [1] In contrast, in smooth-pursuit movements, the eyes move smoothly instead of in jumps. The phenomenon can be associated with a shift in frequency of an ...
Specialty. Neurology, ophthalmology. Blepharospasm is a neurological disorder characterized by intermittent, involuntary spasms and contractions of the orbicularis oculi (eyelid) muscles around both eyes. [1][2][3][4] These result in abnormal twitching or blinking, and in the extreme, sustained eyelid closure resulting in functional blindness.
However, it is right about now -- with August looming -- that the stress starts to sneak back up on me. ... Eye twitching — You know that annoying feeling your eyelid is moving on its own, and ...
A. Afterlife: (or life after death) A generic term referring to a purported continuation of existence, typically spiritual and experiential, beyond this world, or a personal reputation that is so strong as to be capable of persistent social influence long after death. (see also soul) Agnosticism: the view that the existence of God or the ...
Molyneux's problem is a thought experiment in philosophy [1] concerning immediate recovery from blindness. It was first formulated by William Molyneux, and notably referred to in John Locke 's An Essay Concerning Human Understanding (1689). The problem can be stated in brief, "if a man born blind can feel the differences between shapes such as ...
Heterophoria is an eye condition in which the directions that the eyes are pointing at rest position, when not performing binocular fusion, are not the same as each other, or, "not straight". This condition can be esophoria, where the eyes tend to cross inward in the absence of fusion; exophoria, in which they diverge; hyperphoria, in which one ...