Keyhole Iris
𝘐𝘳𝘪𝘴 𝘊𝘰𝘭𝘰𝘣𝘰𝘮𝘢
Closure of the embryonic/optic fissure - completed by 6 weeks
Failure of closure of the fissure in front - formation of an iris coloboma
Typical : Located in the inferonasal quadrant
Atypical : Located elsewhere
𝘛𝘺𝘱𝘦𝘴:
● Total : Whole sector of the iris upto to the ciliary body - ‘keyhole defect’
● Partial : Do not involve whole sector of the iris - appears as notch at the pupillary margin
𝘏𝘪𝘴𝘵𝘰𝘭𝘰𝘨𝘪𝘤𝘢𝘭𝘭𝘺:
● Complete : Whole thickness of iris
● Incomplete : Either pigment epithelium or stroma are involved
● Bridge : Mesectodermal tissue forms a pupillary membrane that stretches across the defect
Due to the enlarged pupillary space → inability to contract pupil properly and increased light entering the eye → sensitive to bright light/ photophobia
Can be associated with early cataract
No treatment if it’s an isolated finding
Image from Rajan Eye Care Hospital
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