Importance Optical coherence tomography software classifies abnormality of macular ganglion cell‐inner plexiform layer thickness and macular retinal nerve fibre layer thickness based on adult series. Background We assessed the impact of using paediatric reference macular ganglion cell complex values instead of adult reference values. Design Cross‐sectional study. Primary and tertiary health‐care setting. Participants Out of 140 healthy participants aged 5 to 18 years, 90% were eligible. Methods Following a dilated eye examination and cycloplegic refraction, participants underwent optical coherence tomography ganglion cell scans (Topcon 3D OCT‐2000; Topcon Corporation, Tokyo, Japan). Right eye measurements for superior, inferior, and total layer thickness and spherical equivalent were reported, together with age, sex and origin. Main Outcome Measures Paediatric reference values by age and spherical equivalent were produced, and the specific agreement between paediatric and adult ganglion cell complex reference values below or equal to percentile 5 was estimated. Results The multivariate analysis confirmed a positive association between spherical equivalent and macular ganglion cell‐inner plexiform layer thickness, and between age and macular retinal nerve fibre layer (five out of six regression coefficients P values were ≤ 0.03). Specific agreement was 25% for ganglion cell‐inner plexiform layer thickness and > 80% for macular retinal nerve fibre layer. Adult‐based software identified low ganglion cell values in one in seven children compared to paediatric reference values (0.8% vs 5.5%, P = 0.031). Conclusions and Relevance The availability of optical coherence tomography ganglion cell complex reference values for paediatric age and spherical equivalent groups can be used to improve detection of children with low cell layer thickness.

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Background: Assessment of interobserver reproducibility and interocular symmetry using optical coherence tomography (OCT)-based measurements of the macular ganglion cell complex (GCC) in healthy children facilitates interpretation of OCT data. We assessed the interobserver reproducibility and interocular symmetry of GCC and evaluated candidate determinants. Methods: This was a cross-sectional study performed in a primary and tertiary health-care setting. A total of 126 healthy participants aged 5 to 18 years were eligible. GCC scans were performed by 4 operators using the Topcon 3D OCT-2000 device. Intraclass correlation coefficients (ICCs) were used to estimate reproducibility and symmetry. Cutoff points for symmetry were defined as the 95th percentile of the absolute interocular difference for 6 GCC parameters. Percentile distributions of interocular difference were generated based on age and difference in absolute interocular spherical equivalent (SE). Results: The reproducibility ICC ranged from 0.96 to 0.98 for all 6 GCC parameters. Cutoff points for interocular symmetry of the superior and inferior quadrants and total macular retinal nerve fibre layer thickness (mRNFL) and macular ganglion cell layerinner plexiform layer thickness were 3.5, 4.5, 3.0, 3.0, 2.5, and 2.5 μm respectively. A positive association was observed between the absolute interocular difference of SE and superior and total mRNFL symmetry values (p = 0.047 and p = 0.040, respectively). Conclusions: OCT measurements of GCC in healthy children show excellent reproducibility. Interocular differences in SE should be assessed when mRNFL differences exceed the 95% cutoff. These findings can contribute to establish reference values for interocular symmetry in paediatric GCC parameters.

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Background The aims of this study were to assess interobserver reproducibility and interocular symmetry using optical coherence tomography (OCT)–based measurements of the macular ganglion cell complex (GCC) in healthy children, and to evaluate candidate determinants of symmetry. Methods Cross-sectional study. A total of 126 healthy participants aged 5 to 18 years recruited in primary and tertiary health-care settings were eligible. GCC scans were performed by 4 operators using the Topcon 3D OCT-2000 device. Intraclass correlation coefficients (ICCs) were used to estimate reproducibility and symmetry. Cut-off points for symmetry were defined as the 95th percentile of the absolute interocular difference for 6 GCC parameters. Percentile distributions of interocular difference were generated based on age and difference in absolute interocular spherical equivalent (SE). Results The reproducibility ICCs ranged from 0.96 to 0.98 for all 6 GCC parameters. Cut-off points for interocular symmetry of the superior and inferior quadrants and total macular retinal nerve fiber layer thickness (mRNFL) and macular ganglion cell layer-inner plexiform layer thickness were 3.5, 4.5, 3.0, 3.0, 2.5, and 2.5 µm respectively. A positive association was observed between the absolute interocular difference of SE and superior and total mRNFL symmetry values (p=0.047 and p=0.040, respectively). Conclusions OCT measurements of GCC in healthy children show excellent reproducibility. Interocular differences in SE should be assessed when mRNFL interocular differences exceed the 95% cut-off.

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