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Congenital aplasia of the iris sphincter and dilator muscles
Y Buys1, J R Buncic, R W Enzenauer
1Department of Ophthalmology, Hospital for Sick Children, Toronto.
Insights
Congenital iris muscle aplasia is a rare condition causing reduced accommodation. This isolated anomaly requires differentiation from neurological causes of a dilated pupil to prevent unnecessary investigations.
Area of Science:
- Ophthalmology
- Pediatric Ophthalmology
- Medical Genetics
Background:
- Congenital aplasia of iris sphincter and dilator muscles is an extremely rare condition.
- It is crucial to distinguish this anomaly from other conditions presenting with similar pupillary abnormalities.
Observation:
- A 3-month-old boy with patent ductus arteriosus presented with congenital iris muscle aplasia.
- No other ocular or systemic abnormalities were noted in the patient.
- The child was followed for over 7 years, exhibiting reduced accommodative amplitudes.
Findings:
- The described condition is an isolated, nonprogressive anomaly.
- It presents with reduced accommodative amplitudes.
- The condition shares some similarities with Gillespie's syndrome but is distinct.
Implications:
- General physicians must be able to differentiate this condition from a neurologically dilated pupil.
- Accurate diagnosis can prevent misdirected and unnecessary investigations.
- Early recognition aids in appropriate patient management and counseling.
Abstract:
Congenital aplasia of the iris sphincter and dilator muscles is rare. We describe a 3-month-old boy with a patent ductus arteriosus who had this anomaly, with no other ocular or systemic abnormalities. The child, whom we followed for over 7 years, had reduced accommodative amplitudes. This anomaly, although it bears some similarity to Gillespie's syndrome, circumpupillary aplasia and aniridia, is an isolated, nonprogressive condition that general physicians need to differentiate from the neurologically dilated pupil so that misdirected, unnecessary investigations can be avoided.