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Scintillating scotoma is a common visual aura that was first described by 19th-century physician Hubert Airy (1838–1903). Originating from the brain, it may precede a migraine headache, but can also occur acephalgically (without headache), also known as visual migraine or migraine aura. [4] It is often confused with retinal migraine, which originates in the eyeball or socket.
The prism angles and materials are chosen such that one wavelength ( colour) of light, the centre wavelength, exits the prism parallel to (but offset from) the entrance beam. The prism assembly is thus a direct-vision prism and is commonly used as such in hand-held spectroscopes.
The extraocular muscles, or extrinsic ocular muscles, are the seven extrinsic muscles of the eye in humans and other animals. [1] Six of the extraocular muscles, the four recti muscles, and the superior and inferior oblique muscles, control movement of the eye. The other muscle, the levator palpebrae superioris, controls eyelid elevation.
The Black Prism is a fantasy novel by American author Brent Weeks. It is the first entry in the five-volume [1] Lightbringer Series, and follows the 'Prism' Gavin Guile, the most powerful person in the world, [2] as he fights against an uprising by a self-proclaimed king. The book is described by the author as "a story of normal brothers—who ...
The Broken Eye is a 2014 epic fantasy novel by New York Times Bestselling author Brent Weeks. It is the third book in his Lightbringer series, following The Black Prism and The Blinding Knife. [1] The novel is written in the third person perspective, shifting between several characters, and further builds the world of the Lightbringer .
Strabismus is a vision disorder in which the eyes do not properly align with each other when looking at an object. [2] The eye that is pointed at an object can alternate. [3] The condition may be present occasionally or constantly. [3] If present during a large part of childhood, it may result in amblyopia, or lazy eyes, and loss of depth perception. [3] If onset is during adulthood, it is ...
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