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Alternating occlusion training, also referred to as electronic rapid alternate occlusion, is an approach to amblyopia and to intermittent central suppression in vision therapy, in which electronic devices such as programmable liquid crystal shutter glasses or goggles are used to block the field of view of one eye in rapid alternation. When performing alternating occlusion training, the person wears the occlusion goggles continuously for several hours while performing regular everyday activities. Wearing the device encourages or forces the alternating use of both eyes, similar to eye patching, but rapidly alternating in time. The aim is to circumvent the tendency to suppress the field of view of the weaker eye and to train the capacity for binocular vision. Traditionally, eye patches are used to block the field of view of one eye. Strabismic or amblyopic children are often required to wear an eye patch for hours or days. The use of the patch generally alternates on a daily or weekly basis between the two eyes, with a long time duration for the patching of the stronger eye and a shorter time duration, if any, for the patching of the weaker eye. In contrast to eye patching, training with occlusion goggles allows to use rapid rates of alternation. == Flicker rates == The flicker rates at which the occlusion is alternated between the two eyes in alternating occlusion training are generally much slower than those employed by the widespread active shutter 3D glasses for viewing 3D television or cinema. Therapeutic procedures have been proposed in which the active eye is switched after a duration of many seconds (for example, with an ON (occlusion) duration of 40 seconds and an OFF state (open) duration of 20 seconds of each minute); others propose a much faster flicker rate of approximately 5 Hz.〔 ((abstract ), (full text PDF ))〕 An alternating occlusion device (the so-called ''Translid Binocular Interaction Trainer'' (TBIS) operating at a rate of 9 to 11 Hz) was introduced by Merrill Allen in 1967 to favor parallel processing of the eyes.〔Merrill J. Allen, (Shock treatment for visual rehabilitation ), Journal of the American Optometric Association, August 1967, volume 38, number 8, pages 661-662 (referenced here as citation only), and Merrill J. Allen, Opt. J. Rev. Optom. 1969 as cited by: ((abstract ), (full text PDF ))〕 The flicker rate is crucial with relation to potential side effects and may possibly be relevant for the efficacy of the training. It has been suggested that the flickering sequence could be adapted to suit the depth of amblyopia, the required duration of treatment, the age of the patient, or could be adapted dynamically according to the visual function behavior of the amblyopic eye.〔 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「Alternating occlusion training」の詳細全文を読む スポンサード リンク
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