Interocular symmetry of the peripapillary choroidal thickness and retinal nerve fibre layer thickness in healthy adults with isometropiaReport as inadecuate

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BMC Ophthalmology

, 16:182



BackgroundThe aim of this study was to determine the interocular differences in the peripapillary retinal nerve fibre layer RNFL, peripapillary choroidal thickness PCT and subfoveal choroidal thickness SFCT in healthy adults with isometropia, using enhanced depth imaging optical coherence tomography EDI SD-OCT.

MethodsOne hundred healthy Chinese adults with spherical equivalents of ≤ ±3 dioptres and interocular differences of <0.5 dioptres were prospectively enrolled in this study. They underwent RNFL and PCT measurements via EDI SD-OCT, with a 3.4 mm scan circle centred on the optic nerve head. Subfoveal choroidal thickness SFCT measurements were also taken with a horizontal line scan centred on the macula. Right and left eyes were compared by a paired t-test, and the interocular differences were calculated. The agreement and correlations of the RNFLs, PCTs and SFCTs between the right and left eyes were analysed.

ResultsEighty-six subjects 172 eyes were included in the final analysis, consisting of 44 51.6 % males and 42 48.8 % females; 55 63.9 % had emmetropia and 33 36.1 % had ametropia. The RNFL was statistically significantly thicker in the right eyes when compared to the left eyes in the temporal quadrant, and thinner on average in the nasal superior quadrant p < 0.05. However, the differences in the choroidal thicknesses in all of the quadrants between the right and left eyes were not statistically significant. The tolerance limits of the average RNFL were −21.1 μm and 7.1 μm, and the mean and standard deviation of the interocular difference in the average PCT was −2.2 ± 24.2 μm. The RNFLs and PCTs in all of the locations in the right eyes were significantly correlated with those in the left eyes. However, no significant associations between the age, sex, interocular asymmetry of spherical the equivalent or interocular differences in the RNFL and PCT were detected.

ConclusionThe PCT did not differ significantly between the right and left eyes, although interocular asymmetry of the RNFL existed in this Chinese population with isometropia.

KeywordsSymmetry Emmetropia RNFL Choroidalthickness EDI SD-OCT Abbreviations95 % CI95 % confidential interval

BCVABest corrected visual acuity

EDI-OCTEnhanced depth imaging optical coherence tomography

ICCIntraclass correlation coefficient

IOPIntraocular pressure

NNasal quadrant

NINasal inferior quadrant

NSNasal superior quadrant

PCTPeripapillarychoroidal thickness

RNFLPeripapillary retinal nerve fiber layer

RNFLRetinal nerve fibre layer

SDStandard deviation

SESpherical equivalent

SFCTSubfovealchoroidal thickness

TTemporal quadrant

TITemporal inferior quadrant

TSTemporal superior quadrant

ΔInterocular difference right eye minus left eye

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Author: Mo Yang - Wei Wang - Quangang Xu - Shaoying Tan - Shihui Wei


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