KnowraIrisLinked fromLinked fromThe 16 pages that link to Iris, each with the reason it gives.All 16Broader topic 9Related 3Narrower topic 3Compared with 1PupilNarrower topic: The pupil is the opening whose size the iris changes.Blue eyesNarrower topic: Its tissue and pigment determine how much light is absorbed or scattered.Eye colorNarrower topic: Its layered tissue and pigment create the visible surface whose coloration defines eye color.