Temporal-to-Nasal Macular Ganglion Cell and Inner Plexiform Layer Ratios in a Large Adult Twin Cohort: Correlations With Age and Heritability.

The difference between mean inner and outer ratios fell short of significance ( P = 0.076).

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In the present study, we found a weak but highly significant relationship such that older participants had lower ratios on average; this was seen for both inner and outer ratios and for both OCT devices (although the relationship with age failed to reach significance for the outer ratio with the Topcon device; this was likely to be related to the much smaller sample size for this cohort).

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A weak but highly significant negative correlation was observed with age for both inner and outer ratios, with correlation coefficients of −0.17 and −0.21, respectively.

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Intrapair correlation was consistently greater for MZ than for DZ pairs for both the inner and outer ratios, indicating that genetic factors are likely to be significant (MZ pairs share all of their genes whereas DZ pairs share approximately half; the shared environment, however, is assumed to be similar for both MZ and DZ pairs).

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