PROBLEM TO BE SOLVED: To provide a filter capable of preventing photophobia from a new viewpoint being an interception of light to a new visual path (path through ganglion cell) instead of a conventional interception of light to a visual path (path through blue pyramidal cell), and having excellent external appearance and a natural color tone to be recognized when attached.SOLUTION: In the optical filter: (A-1) a peak wavelength of light intercepted in a visible range is 485 nm and (B) a wavelength which has half an interception rate of an interception rate of the peak wavelength is in a range within about 20 nm from the peak wavelength.COPYRIGHT: (C)2012,JPO&INPIT【課題】これまでの視覚経路(青錐体細胞を経る経路)に対する光の遮断ではなく、新たな視覚経路(神経節細胞を経る経路)に対する光の遮断という新たな観点から羞明を予防可能であり、外観が良好で、装用時に認識する色合いが自然なフィルタを提供する。【解決手段】本発明における光学フィルタは、(A-1)可視領域内における遮断する光のピーク波長が485nmにあり、且つ(B)当該ピーク波長における遮断率の半分の遮断率となる波長が、当該ピーク波長から前後20nm以内の範囲にある。【選択図】図2
