Objective To investigate the correlation between retinal shape and thickness in the macular region by comparing with the axial length(AL).Methods A total of 101 volunteers(101 eyes)were included and divided into three groups based on AL:no(AL≤24 mm,27 eyes),mild(AL>24-26 mm,42 eyes),and high(AL>26 mm,32 eyes)axial myopia groups.The retinal thickness parameters and posterior pole images were obtained by optical coherence tomography.The retinal thickness of the fovea and superior,inferior,nasal,and temporal sides of the perifovea were compared among the three groups.The least square method was applied to fit the ellipse that best matched the shape of the posterior pole retina,and the correlation between its eccentricity(e)and retinal thickness was evaluated.Results There were no significant differences in retinal thickness in the five areas among the three groups(all P>0.05).For the fovea,retinal thickness showed no significant correlation with AL ande(both P>0.05).For the perifovea,the thickness of the superior,inferior,and nasal areas negatively correlated with the AL(all P<0.05),and the thickness of the superior,inferior,nasal,and temporal area negatively correlated withe(all P<0.05).On perifoveal retinal thickness,ehad a greater impact than AL.Conclusion The foveal retinal thickness is not related,while the perifoveal retinal thickness thinning is closely associated with the steep retinal shape.
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