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Yoked prism can move the image away from primary gaze without the need for a constant head tilt or turn. Prism correction is measured in prism dioptres. A prescription that specifies prism correction will also specify the "base". The base is the thickest part of the lens and is opposite from the apex.
Prism (optics) An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.
Fixation disparity. Fixation disparity is a tendency of the eyes to drift in the direction of the heterophoria. While the heterophoria refers to a fusion-free vergence state, the fixation disparity refers to a small misalignment of the visual axes when both eyes are open in an observer with normal fusion and binocular vision. [1]
John Shearer/Getty Images Olivia Munn said she was “devastated” after a double mastectomy following her breast cancer diagnosis last year. “I cried a week after, because that was the first ...
Joseph Fiennes and Natascha McElhone have joined the cast of Amazon Prime Video’s “Young Sherlock” as series regulars. Fiennes — the uncle of Hero Fiennes Tiffin, who plays Sherlock Holmes ...
In total, David has six biological children of his own: daughters Allison Jones Foster, Amy Skylark Foster, Sara Foster, Erin Foster and Jordan Foster, and son Rennie Foster, whom he and McPhee ...
Homonymous hemianopsia. Hemianopsia, or hemianopia, is a visual field loss on the left or right side of the vertical midline. It can affect one eye but usually affects both eyes. Homonymous hemianopsia (or homonymous hemianopia) is hemianopic visual field loss on the same side of both eyes. Homonymous hemianopsia occurs because the right half ...
A New York Times story this week about tennis legend Chris Evert’s battle—twice—with ovarian cancer painted a simple and powerful picture: Fearing for her own risk after her sister died of ...