Flicker perimetry in diabetic children without retinopathy

Area of Science:

• Ophthalmology
• Pediatrics
• Endocrinology

Background:

• Insulin-dependent diabetes mellitus (IDDM) can affect various bodily systems, including the eyes.
• Early detection of visual pathway dysfunction is crucial in managing diabetic complications.
• Retinopathy is a known complication, but subclinical visual pathway changes may exist.

Purpose of the Study:

• To assess retinal flicker fusion frequency in children and adolescents with IDDM.
• To investigate the relationship between metabolic control and retinal flicker sensitivity.
• To determine if flicker perimetry can detect visual impairment in diabetic children without retinopathy.

Main Methods:

• Cross-sectional study involving 45 children/adolescents with IDDM and 45 healthy controls.
• Patients were categorized into good (HbA1c ≤9%) and poor (HbA1c >9%) metabolic control groups.
• Retinal flicker fusion frequency was measured using an automated flicker perimeter within the central 30 degrees of the visual field.

Main Results:

• Children with poorly controlled IDDM exhibited significantly lower flicker fusion frequency compared to controls and those with good control (p < 0.001).
• A significant negative correlation was found between flicker fusion frequency and hemoglobin A1c levels (r = -0.533, p < 0.001).
• These findings indicate impaired retinal flicker sensitivity in the central visual field of poorly controlled diabetic children.

Conclusions:

• Poorly controlled IDDM in children, even without retinopathy, is associated with impaired retinal flicker sensitivity.
• The degree of metabolic control directly correlates with the observed visual impairment.
• Flicker perimetry offers a simple, noninvasive method for evaluating visual function in diabetic children.