Iris sign signifying a tendency to constipation or a sluggish colon

The contracted or constricted Collarette is the zig zag iris sign with a rail track like appearance. This shows there may be a tendency to a sluggish bowel. See the zig zag iris sign - collarette - is closer to the pupil than other collarette signs. This is a left iris. And we can see the zig zag  rail track collarette [...]