Page 117 - The Indian Optician Digital Edition November-December 2021

artery biopsy to detect the presence of GCA. If
GCA is detected, systemic steroids should be
administered immediately to prevent vision loss
in the unaffected eye.
2
It is not until AAION has been properly ruled
out that a definitive diagnosis of NAION can
be made. Unfortunately, there is currently no
known treatment for NAION. However, it is
advised to treat any underlying systemic risk
factors in order to decrease the risk of NAION in
the fellow eye. The optic disc edema in NAION
typically resolves in 6-11 weeks and roughly 40%
of patients will see mild improvement in vision
or visual field in 3-6 months. 7
FIGURE 3 - OPTICAL COHERENCE TOMOGRAPHY (OCT) OF OPTIC DISC
EDEMA OF THE LEFT EYE SECONDARY TO NAION. A RIGHT EYE “DISC AT
RISK” WITH A SMALL, CROWDED OPTIC NERVE HEAD WITH A SMALL CUP TO
DISC RATIO OF LESS THAN 0.3
FIGURE 4 - AUTOMATED 30-2 VISUAL FIELD OF THE
LEFT EYE IN PATIENT WITH NAION DEMONSTRATING
AN INFERIOR ALTITUDINAL VISUAL FIELD DEFECT
REFERENCES
1. Behbehani R., Ali A., Al-Moosa A.
Risk factors and visual outcome
of non-arteritic ischemic optic
neuropathy (NAION): Experience
of a tertiary center in Kuwait.
PLOS ONE 2021;16(2).
2. Biousse V., Newman N.
Ischemic optic neuropathies.
New England J Med
2015;372(25):2428-2436.
3. Lee A., Sinclair A., Sadaka A.,
Berry S., Mollan S., (eds). Neuro-
Ophthalmology: Global Trends
in Diagnosis, Treatment and
Management. Springer 2019;23-
39.
4. Donaldson L., Margolin E.
Approach to patient with
unilateral optic disc edema and
normal visual function. J Neurol
Sci. 2021;424:117414.
5. Skorin L.: Nonarteritic ischemic
optic neuropathy, In: Onofrey
B., Skorin L., Holdeman N, (eds).
Ocular Therapeutics Handbook:
A Clinical Manual, 4th ed.
Wolters Kluwer 2020;637-639.
6. Rizzo J., Lessell S. Optic
neuritis and ischemic optic
neuropathy. Overlapping clinical
profiles. Arch Ophthalmol
1991;109(12):1668-1672.
7. Nika B., Wajda B., (eds). The
Wills Eye Manual: Office and
Emergency Room Diagnosis
and Treatment of Eye Disease.
Wolters Kluwer 2017;233-278.
113 | CLINICAL