[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"kakomon-q-2026-ippan-18":3},{"slug":4,"exam_year":5,"exam_round":6,"section":7,"section_code":8,"number":9,"body":10,"choices":11,"correct_indices":28,"explanation":29,"has_explanation":15,"tags":30},"2026-ippan-18",2026,4,"一般","ippan",18,"瞳孔の大きさを調整するのはどれか。",[12,16,20,23,25],{"index":13,"body":14,"is_correct":15},1,"虹彩",true,{"index":17,"body":18,"is_correct":19},2,"角膜",false,{"index":21,"body":22,"is_correct":19},3,"強膜",{"index":6,"body":24,"is_correct":19},"網膜",{"index":26,"body":27,"is_correct":19},5,"水晶体",[13],"正答は1（虹彩）。虹彩は瞳孔の周りの膜で、伸縮して瞳孔の大きさを変え、目に入る光量を調節する。2角膜は光を屈折させる透明な膜、3強膜は眼球の白い外壁、4網膜は光を受容する膜、5水晶体はピント調節を担い、いずれも瞳孔径の調整はしない。よって虹彩。**覚え方**: 瞳孔の大きさ（光量）を変えるのは虹彩。カメラの絞りに相当。",null]