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Microphthalmos and colobomata among mentally retarded individuals
Abstract:
Among 993 visually impaired mentally retarded persons 86 had microphthalmos or colobomata. The aetiology was prenatal infections in 16 cases, 6 had chromosomal aberrations, syndromes previously described were present in 14, private syndromes in 3. Although the malformation association observed in 36 patients had been previously described, it was impossible to assess whether the individual cases were due to environmental or genetic causes, and in 11 cases the associations were apparently previously undescribed.
Insights
Microphthalmia and coloboma affect 8.7% of visually impaired individuals with intellectual disabilities. Etiologies include prenatal infections, chromosomal issues, and various syndromes, with some cases having unknown causes.
Area of Science:
- Ophthalmology
- Genetics
- Developmental Biology
Background:
- Microphthalmia and coloboma are congenital ocular malformations.
- Intellectual disability is a common comorbidity with congenital anomalies.
- Understanding the etiology of these conditions is crucial for genetic counseling and management.
Purpose of the Study:
- To investigate the prevalence and potential etiologies of microphthalmia and coloboma in a cohort of visually impaired individuals with intellectual disabilities.
Main Methods:
- Retrospective chart review of 993 visually impaired individuals with intellectual disabilities.
- Ophthalmological examination and genetic evaluation for identified cases.
Main Results:
- 86 out of 993 individuals (8.7%) presented with microphthalmia or coloboma.
- Identified etiologies included prenatal infections (16 cases), chromosomal aberrations (6 cases), previously described syndromes (14 cases), and private syndromes (3 cases).
- Malformation associations were previously described in 36 cases, with 11 cases showing apparently undescribed associations; etiology remained undetermined in these instances.
Conclusions:
- Microphthalmia and coloboma are significant findings in visually impaired individuals with intellectual disabilities.
- A multifactorial etiology is suggested, involving genetic and environmental factors.
- Further research is needed to elucidate the causes of undescribed malformation associations.