A pupil expander is disclosed. The pupil expander comprises a support member sized to expand a pupil and a plurality of engaging portions. The plurality of engaging portions are coupled to and spaced about the support member. The engaging portions have a recess and are shaped and sized to receive an inner margin of an iris.揭示一瞳孔擴張器。該瞳孔擴張器包含一具有可擴張一瞳孔的尺寸的一支承件及複數個接合部。該等複數個接合部係耦接至該支承件且環繞該支承件而隔開。該等接合部係具有一凹部,其形狀及尺寸可接納一虹膜的內緣。