一副好的泳鏡，必須能保持水上水下視力的一致性，不會產生頭暈的現象並且能做到水中不漏水、防霧、阻力小、不壓迫眼球、視野寬廣、高透光率。至於水中有度數的泳鏡，必須與一般陸地上近視眼鏡的功能一樣，能矯正視力，左右眼度數準確，符合兩眼瞳孔距離，鏡片輕巧，視野不扭曲變形。

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