Gunn Dots in Children Aged 11-12 Years From the General Community Sample Copenhagen Child Cohort 2000 Study

PURPOSE: To study characteristics and associations of Gunn dots in a cohort of healthy children aged 11 to 12 years.

METHODS: As part of the Copenhagen Child Cohort 2000 Study, red-free fundus photographs were taken on 761 healthy children aged 11 to 12 years. The photographs were centered on the optic disk. Gunn dots were annotated and counted within a disk-centered circular grid of 6 mm diameter. Data were analyzed in relation to age, sex, axial length, and retinal nerve fiber layer thickness.

RESULTS: Gunn dots were found in 716 of the 761 participants (94%). The majority of dots were located both inferior and superior to the optic disk, situated within a distance of 3 mm from its center. The median number of Gunn dots was 64 (range 0-574) in right eyes and 68 (range 0-532) in left eyes. Having more than the median number of Gunn dots in the right eye was associated with older age (odds ratio 2.12, 95% CI 1.56 to 2.89, P < 0.0001, adjusted for sex, axial length, and retinal nerve fiber layer thickness) and was less common among the children with a thinner retinal nerve fiber layer (odds ratio 0.40, 95% CI 0.26-0.60, P < 0.0001 comparing bottom and top quartiles).

CONCLUSION: Gunn dots were visible in the majority of healthy children aged 11 to 12 years, and large numbers of dots were associated with a thicker nerve fiber layer and with older age, within the limited age range of 1 year. The clinical significance of Gunn dots is unknown. Their location at the vitreoretinal interface makes them a parameter of interest in the study of aging, epiretinal fibrosis, macular pucker and retinal detachment.