A tip part for an insertable vision device, and an insertable vision device including the tip part. The tip part includes a housing accommodating an electronic vision receptor and adapted to extend from a distal end of an insertable elongate portion of the insertable vision device, and a light guide positioned within the housing, the light guide having a predetermined length in a longitudinal direction between a light reception end and a light emission end, the light reception end configured to receive light emanated from a light source and the light emission end configured to emit the light. The light guide includes, along at least a portion of the predetermined length, an expanding sector or a narrowing sector.
