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Association between local neuroretinal function and control of adolescent type 1 diabetes
Michal Laron1, Marcus A Bearse, Kevin Bronson-Castain
1School of Optometry, University of California-Berkeley, Berkeley, California 94720-2020, USA.
Investigative Ophthalmology & Visual Science
|September 15, 2012
Summary
Adolescents with type 1 diabetes show impaired neuroretinal function, linked to higher HbA1c. Over 20% exhibit abnormal multifocal electroretinogram (mfERG) implicit times, indicating early diabetic eye disease.
Area of Science:
- Ophthalmology
- Endocrinology
- Neuroscience
Background:
- Type 1 diabetes (T1D) management requires monitoring for complications.
- Early detection of neuroretinal dysfunction is crucial in T1D patients.
- Retinopathy is a known complication, but subclinical changes are less understood.
Purpose of the Study:
- To assess neuroretinal function using multifocal electroretinogram (mfERG) in adolescents with T1D.
- To correlate mfERG findings with diabetes control variables (HbA1c, blood glucose).
- To identify the prevalence of neuroretinal abnormalities in this population.
Main Methods:
- mfERG was performed on 115 adolescents with T1D and 30 controls.
- Fundus photography and glycemic control metrics (HbA1c, blood glucose) were collected.
- Linear regression analyzed associations between mfERG parameters (implicit time, amplitude) and disease variables.
Main Results:
- Patients with T1D had significantly longer mfERG implicit times (IT) compared to controls.
- No significant difference in mfERG amplitude (AMP) was observed.
- 23% of T1D patients showed abnormal IT, while 3% had abnormal AMP.
- Higher HbA1c levels correlated positively with prolonged IT.
Conclusions:
- Elevated long-term blood glucose (HbA1c) is associated with reduced neuroretinal function in adolescents with T1D.
- A significant proportion of adolescents with T1D and no visible retinopathy have impaired neuroretinal function.
- Longitudinal studies are needed to confirm the relationship between mfERG IT and diabetes control in individuals.
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