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Abbe number; Abbe prism; Abbe sine condition; Aberration in optical systems; Absorption; Absorption spectrum; Acousto-optics; Acousto-optic deflector; Acousto-optic filter
The wedge prism is a prism with a shallow angle between its input and output surfaces. This angle is usually 3 degrees or less. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism.
Ophthalmologists generally provide specialty eye care and manage late stage eye disease (often only mitigated with surgery). Optometrists typically provide comprehensive eye care - including medical, up to a moderate stage (managed with prescription medications). There is considerable overlap in scope of practice between professions.
In some lenses, the curved surfaces are replaced with flat surfaces, with a different angle in each section. Such a lens can be regarded as an array of prisms arranged in a circular fashion with steeper prisms on the edges and a flat or slightly convex center. In the first (and largest) Fresnel lenses, each section was actually a separate prism.
In a left esotropia, the left eye 'squints', and in a right esotropia the right eye 'squints'. In an alternating esotropia, the patient is able to alternate fixation between their right and left eye so that at one moment the right eye fixates and the left eye turns inward, and at the next the left eye fixates and the right turns inward. This ...
Amulet from the tomb of Tutankhamun, fourteenth century BC, incorporating the Eye of Horus beneath a disk and crescent symbol representing the moon [2]. The ancient Egyptian god Horus was a sky deity, and many Egyptian texts say that Horus's right eye was the sun and his left eye the moon. [3]
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