| annulus iridis | Either of two zones on the anterior surface of the iris, separated by a circular line concentric with the pupillary border. Synonym: annulus iridis. (05 Mar 2000) |
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| annulus iridis major | The outer, broader of the two zones of the iris. Synonym: annulus iridis major. (05 Mar 2000) |
| annulus iridis minor | The narrow inner zone of the iris. Synonym: annulus iridis minor. (05 Mar 2000) |
| atresia iridis | Congenital absence of the pupillary opening. Synonym: atretopsia. (05 Mar 2000) |
| margo ciliaris iridis | The peripheral border of the iris attached to the ciliary body. Synonym: margo ciliaris iridis, ciliary margin of iris. (05 Mar 2000) |
| margo pupillaris iridis | The inner border of the iris that forms the edge of the pupil. Synonym: margo pupillaris iridis, pupillary margin of iris. (05 Mar 2000) |
| vitiligo iridis | Small white patches in brown irides. (05 Mar 2000) |
| circulus arteriosus iridis major | An arterial circle at the ciliary border of the iris. Synonym: circulus arteriosus iridis major. (05 Mar 2000) |
| circulus arteriosus iridis minor | An arterial circle near the pupillary margin of the iris. Synonym: circulus arteriosus iridis minor. (05 Mar 2000) |
| coloboma iridis | Retention of the choroid fissure causing a congenital cleft of the iris, often associated with coloboma of the choroid, viable in the inferior ocular fundus, obsolete term for the iris defect resulting from a large surgical iridectomy. (05 Mar 2000) |
| musculus dilator iridis | <anatomy> The radial muscular fibres extending from the sphincter pupillae to the ciliary margin; some anatomists regard them as elastic, not muscular, in humans. Synonym: musculus dilator pupillae, dilator iridis, dilator of pupil, musculus dilator iridis. (05 Mar 2000) |
| heterochromia iridis | A difference of colour between the iris of one eye and the other. (a person with one brown and one blue eye has heterochromia iridis.) also, a difference in colour within an iris (sectoral heterochromia iridis). (12 Dec 1998) |
| stratum pigmenti iridis | The double layer of pigmented epithelium on the posterior surface of the iris. Synonym: pigmented layer of iris. (05 Mar 2000) |
| stroma iridis | The delicate vascular connective tissue that lies between the anterior surface of the iris and the pars iridica retinae. Synonym: stroma iridis. (05 Mar 2000) |
| dilator iridis | <anatomy> The radial muscular fibres extending from the sphincter pupillae to the ciliary margin; some anatomists regard them as elastic, not muscular, in humans. Synonym: musculus dilator pupillae, dilator iridis, dilator of pupil, musculus dilator iridis. (05 Mar 2000) |