| Title: | Total retinal thickness: a neglected factor in the evaluation of inner retinal thickness |
| Journal: | BMJ Open Ophthalmology |
| Published: | 30 Sep 2022 |
| Pubmed: | https://pubmed.ncbi.nlm.nih.gov/36329022/ |
| DOI: | https://doi.org/10.1136/bmjophth-2022-001061 |
| URL: | https://bmjophth.bmj.com/content/bmjophth/7/1/e001061.full.pdf |
Publication 10492
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Abstract
AIM: To determine whether macular retinal nerve fibre layer (mRNFL) and ganglion cell-inner plexiform layer (GC-IPL) thicknesses vary by ethnicity after accounting for total retinal thickness.</p>
METHODS: We included healthy participants from the UK Biobank cohort who underwent macula-centred spectral domain-optical coherence tomography scans. mRNFL and GC-IPL thicknesses were determined for groups from different self-reported ethnic backgrounds. Multivariable regression models adjusting for covariables including age, gender, ethnicity and refractive error were built, with and without adjusting for total retinal thickness.</p>
RESULTS: 20237 participants were analysed. Prior to accounting for total retinal thickness, mRNFL thickness was on average 0.9 μm (-1.2, -0.6; p<0.001) lower among Asians and 1.5 μm (-2.3, -0.6; p<0.001) lower among black participants compared with white participants. Prior to accounting for total retinal thickness, the average GC-IPL thickness was 1.9 μm (-2.5, -1.4; p<0.001) lower among Asians compared with white participants, and 2.4 μm (-3.9, -1.0; p=0.001) lower among black participants compared with white participants. After accounting for total retinal thickness, the layer thicknesses were not significantly different among ethnic groups. When considered as a proportion of total retinal thickness, mRNFL thickness was ~0.1 and GC-IPL thickness was ~0.2 across age, gender and ethnic groups.</p>
CONCLUSIONS: The previously reported ethnic differences in layer thickness among groups are likely driven by differences in total retinal thickness. Our results suggest using layer thickness ratio (retinal layer thicknesses/total retinal thickness) rather than absolute thickness values when comparing retinal layer thicknesses across groups.</p>
11 Authors
- Mark Banghart
- Kyungmoo Lee
- Mozhdeh Bahrainian
- Kristen Staggers
- Christopher Amos
- Yao Liu
- Amitha Domalpally
- Benjamin J Frankfort
- Elliott H Sohn
- Michael Abramoff
- Roomasa Channa
1 Application
| Application ID | Title |
|---|---|
| 41561 | Genetic factors associated with Diabetic retinopathy |
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