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Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.
Anisometropia is a condition in which a person's eyes have substantially differing refractive power, such as one eye being nearsighted and the other farsighted. It can cause vision problems, amblyopia, or aniseikonia, and may require spectacles, contact lenses, or refractive surgery to correct.
Hemispatial neglect is a neuropsychological condition in which a person fails to perceive or attend to the side of space opposite to brain damage. It is most commonly caused by strokes affecting the right parietal lobe and can affect visual, auditory, proprioceptive and olfactory perception.
A progressive lens is a corrective lens used in eyeglasses to correct presbyopia and other disorders of accommodation. It has a gradient of increasing lens power from top to bottom, and can provide clear vision at different distances. Learn about its history, design, advantages, disadvantages and adaptation.
Bifocals are eyeglasses with two distinct optical powers, commonly prescribed to people with presbyopia. Benjamin Franklin is generally credited with the invention of bifocals, but there is some evidence that others may have come before him.
Sixth nerve palsy, also known as abducens nerve palsy, is a disorder of the eye muscle that causes double vision and inability to turn the eye outward. It can be caused by various factors, such as diabetes, trauma, tumors, infections, or increased intracranial pressure, and affects different parts of the nerve along its pathway.
Eye glasses with an included prism power is the optical method to reduce a fixation disparity. Different procedures have been proposed to determine the required amount of prism for the individual. Based on prism-FD curves (Fig. 3b), one can find the aligning prism sP 0 that nullifies the naturally prevailing fixation disparity sFD 0. This test ...
This can cause double vision, blurry vision, or a loss of depth perception. ... And “unlike prism glasses, surgery can help a patient who has no double vision, but is bothered by the appearance ...
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