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Quantitative assessment of optic nerve head morphology and retinal nerve fibre layer in non-arteritic anterior ischaemic optic neuropathy with optical coherence tomography and confocal scanning laser ophthalmoloscopy
  1. Carmen K M Chan (kmcc2001{at}hotmail.com),
  2. Andy C O Cheng (acocheng{at}gmail.com),
  3. Christopher K S Leung (cksleung{at}gmail.com),
  4. Carol Y L Cheung (carolcheung{at}cuhk.edu.hk),
  5. Astrid Y Yung (yyastrid{at}hotmail.com),
  6. Bo Gong (gongbo2007{at}hotmail.com),
  7. Dennis S C Lam (dennislam_pub{at}cuhk.edu.hk)
  1. The Chinese University of Hong Kong, Hong Kong
  2. The Chinese University of Hong Kong, Hong Kong
  3. The Chinese University of Hong Kong, Hong Kong
  4. The Chinese University of Hong Kong, Hong Kong
  5. The Chinese University of Hong Kong, Hong Kong
  6. The Chinese University of Hong Kong, Hong Kong
  7. The Chinese University of Hong Kong, Hong Kong

    Abstract

    Background/ aims: To compare the optic disc parameters between patients with non-arteritic anterior ischaemic optic neuropathy (NAION) and normal controls, using optical coherence tomography (OCT) and Heidelberg Retinal Tomograph III (HRT); and to evaluate the structure-function relationship in NAION eyes.

    Methods: Both eyes of 22 patients with typical unilateral NAION of ≥ 6 months' duration and 52 eyes from 52 randomly selected normal subjects underwent Humphrey visual field (HVF) examination and measurement of optic disc and retinal nerve fibre layer thickness (RNFLT).

    Results: For the NAION affected eyes, NAION fellow eyes and normal controls, the magnification-corrected OCT disc areas were respectively 1.849±0.343mm2, 1.809±0.285mm2 and 1.964±0.386mm2; the cup areas were 0.246±0.187mm2, 0.172±0.180mm2 and 0.469±0.332mm2. On HRT, the disc areas were 2.11±0.38mm2, 2.06±0.40mm2 and 2.16±0.42mm2; and the cup areas were 0.28±0.34mm2, 0.25±0.18mm2 and 0.48±0.32mm2. On both OCT and HRT, the cup areas and cup/disc area ratios (CDAR) of both eyes of NAION patients were significantly smaller than controls (p ≤0.002), but the disc areas were not (p≥0.21). There was a significant correlation between HVF mean deviation and OCT RNFLT (r= 0.44, p=0.04), but not with HRT RNFLT (p=0.30) in NAION eyes.

    Conclusion: NAION patients have smaller cups and CDARs in both eyes compared to controls. A larger sample size is necessary to demonstrate if disc size affects the risk of developing NAION. The NAION eyes' OCT RNFLT had a better correlation with HVF than that measured by HRT.

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