J Korean Ophthalmol Soc.  2019 Sep;60(9):881-886. 10.3341/jkos.2019.60.9.881.

The Function of the Fellow Eye in Patients with Unilateral Nonarteritic Anterior Ischemic Optic Neuropathy

  • 1Department of Ophthalmology, Dankook University College of Medicine, Cheonan, Korea. kseeye@hanmail.net


To investigate the function of the fellow eye in patients with unilateral nonarteritic anterior ischemic optic neuropathy (NAION).
From 2009 to March 2018, 18 patients with NAION who underwent bilateral visual field examinations and follow-up visits at least two times were enrolled in this study. Initial visual acuity, final visual acuity, degree of visual field defects, the cup-disc (C/D) ratio of the fellow eye, and the presence or absence of cardiovascular disease was retrospectively analyzed using medical records.
The fellow eye mean best-corrected visual acuity was 0.03 ± 0.53 (logMAR) and the mean visual field defect was −4.68 ± 3.65 dB in 18 eyes of patients with unilateral NAION (p = 0.007 and p = 0.001, respectively). The C/D ratios were divided into two groups: > 0.3 and < 0.3. The visual field defect was improved significantly from −4.92 dB to −2.37 dB in the group with optic disc ratios < 0.3 (p = 0.013). When the changes in visual field defects were analyzed according to the presence or absence of cardiovascular disease, the visual field defects were improved from −5.65 dB to −4.49 dB in patients with cardiovascular disease, and improved from −3.69 dB to −1.46 dB in patients without cardiovascular disease (p = 0.025 and p = 0.021, respectively).
In patients with unilateral NAION, reduced function in the fellow eye may appear temporarily, so a visual field examination should be performed in both eyes. The possibility of incipient NAION should be considered in patients with visual field abnormalities in the fellow eye.


Incipient Nonarteritic anterior ischemic optic neuropathy; Nonarteritic anterior ischemic optic neuropathy; Visual field

MeSH Terms

Cardiovascular Diseases
Follow-Up Studies
Medical Records
Optic Neuropathy, Ischemic*
Retrospective Studies
Visual Acuity
Visual Fields
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