Purpose: To assess macular microstructure in eyes with tilted disk syndrome (TDS) and determine the relationship between TDS foveal morphology and visual function.
Methods: Twenty-six TDS eyes from 19 children (aged 5∼15 years) with a spherical equivalent refraction (SER) of -3.1 ± 1.3 diopter (D) and 28 control eyes from 14 children (aged 7∼12 years) with a SER of -3.0 ± 0.7 D were recruited. Horizontal and vertical optical coherence tomography scans through the fovea produced images that were segmented into eight intraretinal layers. Thicknesses of the total retina and each layer were measured at the foveal center and 12 other macular locations: 500 μm, 1,000 μm, and 1,500 μm along the horizontal and vertical meridians. The relationships between TDS best correct visual acuity (BCVA) and the presence of photoreceptor inner/outer segment (IS/OS) junction line, IS/OS foveal bulge, and cone outer segment tip (COST) line were evaluated.
Results: The thickness of TDS central fovea, 218.94 ± 22.20 μm, was not significantly different from controls. The total retinal thickness in TDS eyes was thinner than controls at all peripheral locations (P < 0.05) except at 500 μm and 1,000 μm superiorly, and 1,500 μm temporally. Tilted disk syndrome intraretinal layer thicknesses in the nasal and inferior regions varied significantly from controls (P < 0.05). Only 80.7% and 23.1% of TDS eyes had a normal foveal bulge and continuous COST line, respectively, compared with 100% and 96.4% of controls. The BCVA of TDS eyes was similar whether or not the foveal bulge or COST line was abnormal.
Conclusion: Differences in intraretinal layer thickness may be correlated with defective vision.
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