Acute anterior and posterior ischemic optic neuropathy

Area of Science:

• Ophthalmology
• Neurology

Background:

• Acute ischemic optic neuropathy (ION) presents diagnostic challenges.
• ION is broadly categorized into acute anterior ischemic optic neuropathy (AION) and acute posterior ischemic optic neuropathy (PION).

Purpose of the Study:

• To propose diagnostic criteria for acute ION.
• To compare clinical findings and etiological factors of acute AION and acute PION.
• To evaluate the efficacy of steroid therapy in acute ION.

Main Methods:

• Analysis of 31 eyes from 24 cases of acute AION and 20 eyes from 18 cases of acute PION.
• Comparison of diagnostic criteria and clinical presentations.
• Evaluation of etiological factors and laboratory findings (serum lipids, hemostasis, fibrinolysis).
• Assessment of steroid therapy's impact on visual function at different disease stages.

Main Results:

• Acute AION presents with papilledema progressing to optic atrophy; acute PION shows a normal optic disc initially, followed by optic atrophy.
• Acute PION is hypothesized to result from ischemic retrobulbar optic neuritis.
• Laboratory findings in acute ION did not significantly differ from retinal vein occlusion or diabetic retinopathy.
• Steroid therapy showed some visual improvement in the early stage of acute ION but was ineffective in the late stage.

Conclusions:

• Distinct diagnostic criteria and clinical progressions for acute AION and PION were established.
• Ischemic changes are implicated as a cause of acute PION.
• Early intervention with steroids may offer a therapeutic benefit in acute ION, emphasizing the importance of timely diagnosis and treatment.