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B2 is a medical based Paralympic classification for blind sport. Competitors in this classification Athletes in this classification have vision that falls between the B1 and B3 classes. The International Blind Sports Federation (IBSA) defines this classification as "visual acuity ranging from LogMAR 1.50 to 2.60 (inclusive) and/or visual field constricted to a diameter of less than 10 degrees."〔 It is used by a number of blind sports including para-alpine skiing, para-Nordic skiing, blind cricket, blind golf, five-a-side football, goalball and judo. Some sports have equivalents to this class, including adaptive rowing, athletics and swimming. Classification is often handled on the international level by IBSA though classification is also handled by national sport federations. There are exceptions for sports like athletics and cycling, where classification is handled by their own governing bodies. The B2 classification was first created by the IBSA in the 1970s, and has largely remained unchanged since despite an effort by the International Paralympic Committee (IPC) to move towards a more functional and evidence-based classification system. Some sports like athletics and swimming have independently created their own classification equivalent that is comparable to the IBSA created B1 class. Equipment utilized by competitors in this class may differ from sport to sport, and may include sighted guides, guide rails, beeping balls and clapsticks. There may be some modifications related to equipment and rules to specifically address needs of competitors in this class to allow them to compete in specific sports. Some sports such as athletics specifically do not allow a guide, whereas cycling and skiing require one. ==Definition== B2 is a disability sport classification for people who are visually impaired.〔 The International Blind Sports Federation (IBSA) defines this classification as "visual acuity ranging from LogMAR 1.50 to 2.60 (inclusive) and/or visual field constricted to a diameter of less than 10 degrees."〔(【引用サイトリンク】title=Classification )〕 It thus falls between the B1 and B3 classifications.〔 The Canadian Paralympic Committee defined this classification as "Up to approximately 3-5% functional vision." A competitor in this class could read a newspaper if it was no further than away.〔 This classification is borrowed by some other sports, including blind golf who also define the class as "From ability to recognise the shape of a hand up to visual acuity of 2/60 or visual field of less than 5 degrees". Para-alpine skiing sport specific versions of this definition include one by the Australian Paralympic Committee which defined this classification as this classification as "Athletes with some partial vision or the ability to recognise the shape of a hand but have a field of vision less than five degrees." The International Paralympic Committee defined this classification for alpine skiing as "From ability to recognise the shape of a hand up to a visual acuity of 2/60 and/or visual field of less than 5 degrees."〔 This is included as an appendix in the media guide, but it is not published by the APC.〕 This classification has parallels in other sports. The comparative classification in adaptive rowing is LTA-B2.〔 In equestrian, Grade 4 is equivalent to B2. The B2 equivalent for swimming is S12.〔 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「B2 (classification)」の詳細全文を読む スポンサード リンク
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