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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Prism correction ： ウィキペディア英語版 Eye care professionals use prism correction as a component of some eyeglass prescriptions.Sometimes an image that one eye sees is not in line with what the one other eye sees, and so creates an impression of two images instead of only one. A lens which includes some amount of prism correction, will displace the viewed image, as seen by that eye, toward a direction so as to bring that image into proper binocular sync with the image that is viewed by the other eye. This prism correction is used to treat muscular imbalance or other conditions (see vergence dysfunction) that cause errors in eye orientation, such as double-vision.Prism correction is measured in prism dioptres. A prescription that specifies prism correction will also specify the "base", which is the direction of displacement. Whether a patient needs this type of correction or not is determined by the Polatest (a test for the evaluation of binocular vision) elaborated by Hans-Joachim Haase.==Prism dioptres==Prism correction is commonly specified in ''prism dioptres'', a unit of angular measurement that is loosely related to the dioptre. The prism dioptre of a lens is equal to one hundred times the tangent of the angle by which it displaces an image seen through the lens. Prism dioptre is represented by the Greek symbol delta (Δ). The original unit symbol was pdptr (1 pdptr = 1 cm/m).A prism of power 1Δ would produce 1 unit of displacement for an object held 100 units from the prism. Thus a prism of 1Δ would produce 1 cm visible displacement at 100 cm, 2Δ would produce 2 cm displacement at 100 cm, and so on.:P = 100\,\tan d\!where P is the amount of prism correction in prism dioptres, and d is the angle of deviation of the light.For a prism with apex angle a and refractive index n,:d = (n-1)\,a. Eye care professionals use prism correction as a component of some eyeglass prescriptions. Sometimes an image that one eye sees is not in line with what the one other eye sees, and so creates an impression of two images instead of only one. A lens which includes some amount of prism correction, will displace the viewed image, as seen by that eye, toward a direction so as to bring that image into proper binocular sync with the image that is viewed by the other eye. This prism correction is used to treat muscular imbalance or other conditions (see vergence dysfunction) that cause errors in eye orientation, such as double-vision. Prism correction is measured in prism dioptres. A prescription that specifies prism correction will also specify the "base", which is the direction of displacement. Whether a patient needs this type of correction or not is determined by the Polatest (a test for the evaluation of binocular vision) elaborated by Hans-Joachim Haase. ==Prism dioptres== Prism correction is commonly specified in ''prism dioptres'', a unit of angular measurement that is loosely related to the dioptre. The prism dioptre of a lens is equal to one hundred times the tangent of the angle by which it displaces an image seen through the lens. Prism dioptre is represented by the Greek symbol delta (Δ). The original unit symbol was pdptr (1 pdptr = 1 cm/m). A prism of power 1Δ would produce 1 unit of displacement for an object held 100 units from the prism. Thus a prism of 1Δ would produce 1 cm visible displacement at 100 cm, 2Δ would produce 2 cm displacement at 100 cm, and so on. :$P\; =\; 100\backslash ,\backslash tan\; d\backslash !$ where $P$ is the amount of prism correction in prism dioptres, and $d$ is the angle of deviation of the light. For a prism with apex angle $a$ and refractive index $n$, :$d\; =\; (n-1)\backslash ,a$. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eye care professionals use prism correction as a component of some eyeglass prescriptions.Sometimes an image that one eye sees is not in line with what the one other eye sees, and so creates an impression of two images instead of only one. A lens which includes some amount of prism correction, will displace the viewed image, as seen by that eye, toward a direction so as to bring that image into proper binocular sync with the image that is viewed by the other eye. This prism correction is used to treat muscular imbalance or other conditions (see vergence dysfunction) that cause errors in eye orientation, such as double-vision.Prism correction is measured in prism dioptres. A prescription that specifies prism correction will also specify the "base", which is the direction of displacement. Whether a patient needs this type of correction or not is determined by the Polatest (a test for the evaluation of binocular vision) elaborated by Hans-Joachim Haase.==Prism dioptres==Prism correction is commonly specified in ''prism dioptres'', a unit of angular measurement that is loosely related to the dioptre. The prism dioptre of a lens is equal to one hundred times the tangent of the angle by which it displaces an image seen through the lens. Prism dioptre is represented by the Greek symbol delta (Δ). The original unit symbol was pdptr (1 pdptr = 1 cm/m).A prism of power 1Δ would produce 1 unit of displacement for an object held 100 units from the prism. Thus a prism of 1Δ would produce 1 cm visible displacement at 100 cm, 2Δ would produce 2 cm displacement at 100 cm, and so on.:P = 100\,\tan d\!where P is the amount of prism correction in prism dioptres, and d is the angle of deviation of the light.For a prism with apex angle a and refractive index n,:d = (n-1)\,a.」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.