Journal List > J Korean Ophthalmol Soc > v.59(11) > 1107598

Park, Chun, and Moon: Bilateral Delayed Nonarteritic Anterior Ischemic Neuropathy Following Acute Primary Angle-closure Crisis

Abstract

Purpose

We report a case of bilateral nonarteritic anterior ischemic optic neuropathy (NAION) following acute angle-closure crisis (AACC).

Case summary

A 76-year-old female visited our clinic because of a 1-day history of ocular pain and vision loss in both eyes. The visual acuity was 0.02 in both eyes and her intraocular pressure (IOP) was 52 mmHg in the right eye (RE) and 50 mmHg in the left eye (LE). She had corneal edema and a shallow anterior chamber in both eyes, with 4 mm fixed dilated pupils. After decreasing the IOP with intravenous mannitol, laser iridotomy was performed. However, 2 days later, visual acuity was further reduced to finger counting at 10 cm RE and at 50 cm LE, and her optic disc was swollen. Bilateral NAION following AACC was diagnosed. One month later, visual acuity slightly improved to 0.02 RE and 0.04 LE, and the optic disc edema resolved. A small cup-disc ratio, optic disc pallor, and atrophy were observed. Humphrey visual fields demonstrated superior and inferior altitudial visual field defects in the LE, and almost total scotoma in the RE.

Conclusions

AACC can be a predisposing factor for NAION, so the relative afferent pupillary defect, papilledema, and presentation of other risk factors are important clues to a diagnosis of NAION.

References

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Figure 1.
Fundus photography images in both eyes. Fundus photograph at the second visit displayed asteroid aggregates that obscured optic disc of the right eye (A) and diffuse disc edema of the left eye (B). At 1 months (C) and 7 months (D) after nonarteritic anterior ischemic optic neuropathy following acute angle-closure crisis, resolution of optic disc edema, a small cup-to-disc ratio, optic disc pallor and atrophy were observed in left eye.
jkos-59-1091f1.tif
Figure 2.
Swept-source optical coherence tomography of the optic nerve and macula. (A, B) When nonarteritic anterior ischemic optic neuropathy occurred after acute angle-closure crisis, 3D wide analysis demonstrates optic nerve head edema in both eyes and epiretinal membrane in the right eye. (C, D) At 1 month after cataract surgery and 7 months after nonarteritic anterior ischemic optic neuropathy following acute angle-closure crisis, left eye showed the optic disc edema resolution. However, due to conture of epiretinal membranem (ERM), nasal optic disc sector in the right eye remained slightly elevated. All retinal nerve fiber layer thickness (RNFL) in both eyes were significantly decreased, except for the nasal quadrant RNFL thickness in the right eye due to the ERM. S = superior; T = temporal; N = nasal; I = inferior.
jkos-59-1091f2.tif
Figure 3.
The 30–2 program of the humphrey visual field analyzer (HVF). (A) When nonarteritic anterior ischemic optic neuropathy occurred after acute angle-closure crisis, HVF demonstrated almost total scotoma in both eyes. (B) At 1 month after cataract surgery and 7 months after nonarteritic anterior ischemic optic neuropathy following acute angle-closure crisis, HVF demonstrated superior and inferior altitudial visual fields defect in the left eye and almost total scotoma in the right eye.
jkos-59-1091f3.tif
Figure 4.
The standard visual evoked potential (VEP) waveform in response to flash stimuli. (A) When nonarteritic anterior ischemic optic neuropathy occurred after acute angle-closure crisis, VEP showed no response of the right eye and reduced P100 amplitude and prolonged P100 latency with 148 msec in the left eye. (B) At 1 month after cataract surgery and 7 months after nonarteritic anterior ischemic optic neuropathy following acute angle-closure crisis, VEP showed reduced P100 amplitude and prolonged P100 latency with 150 msec in the right eye and 126 msec in the left eye.
jkos-59-1091f4.tif
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