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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 Positive relative accommodation ： ウィキペディア英語版 Positive relative accommodation Positive relative accommodation (PRA) is a measure of the maximum ability to stimulate accommodation while maintaining clear, single binocular vision.〔(www.vision-therapy.com )〕 This measurement is typically obtained by an orthoptist, ophthalmologist or optometrist during an eye examination using a phoropter. After the patient's distance correction is established, he is instructed to view small letters on a card 40 cm from the eyes. The examiner adds lenses in −0.25 diopter increments until the patient first reports that they become blurry. The total value of the lenses added to reach this point is the PRA value. High PRA values (> or = 3.50 diopters) are considered to be diagnostic of disorders involving accommodative excess. Those with accommodative insufficiency typically have PRA values below −1.50 diopters.〔http://www.aoa.org/documents/CPG-18.pdf〕 ==References== 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「Positive relative accommodation」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.