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06 February 2019 : Clinical Research  

Altered Corneal Nerves in Chinese Thyroid-Associated Ophthalmopathy Patients Observed by In Vivo Confocal Microscopy

Lian-Qun Wu12AE, Pei Mou2B, Zi-Yu Chen2B, Jin-Wei Cheng2B, Qi-Hua Le1B, Ji-Ping Cai2C, Rui-Li Wei2AD*

DOI: 10.12659/MSM.912310

Med Sci Monit 2019; 25:1024-1031

Abstract

BACKGROUND: Thyroid-associated ophthalmopathy (TAO) is a common endocrine autoimmune disease. The present study explored corneal nerve changes in TAO patients.

MATERIAL AND METHODS: Thirty-eight Chinese TAO patients and 20 healthy individuals were included in the study. Central corneal subbasal nerve density and morphology were evaluated with in vivo laser scanning confocal microscopy and quantified using automated CCmetrics software.

RESULTS: The values of the central corneal subbasal nerve plexus parameters of both active and inactive TAO patients were significantly decreased compared with those of controls, including corneal nerve fiber density (CNFD) (P<0.001 for both), corneal nerve branch density (CNBD) (P<0.001 for both), corneal nerve fiber length (CNFL) (P<0.001 for both), corneal nerve fiber total branch density (CTBD) (P<0.001 for both), corneal nerve fiber area (CNFA) (P<0.001 for both), corneal nerve fiber width (CNFW) (P=0.046, P=0.027, respectively), and corneal nerve fiber fractal dimension (ACNFrD) (P<0.001 for both). In addition, CNFD and ACNFrD values were significantly lower in the active TAO patients compared with those in the inactive TAO patients (P=0.020, P=0.002, respectively). There were significant correlations between CNFD, CNBD, CNFL, CTBD, CNFA, and ACNFrD and the ocular surface parameters and activity assessment items.

CONCLUSIONS: Abnormal corneal subbasal nerves were observed in both active and inactive Chinese TAO patients, suggesting that nerve degeneration is associated with the disease. However, the exact underlying mechanisms remain to be elucidated.

Keywords: Cornea, Graves Ophthalmopathy, Microscopy, Confocal, Nerve Fibers, Asians, Case-Control Studies, Nerve Tissue, Optic Nerve

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750