Prognosticators for Visual Outcome in Indirect Traumatic Optic Neuropathy: A Prospective Cohort Study

Area of Science:

• Ophthalmology
• Neuroscience
• Medical Imaging

Background:

• Traumatic optic neuropathy (TON), particularly indirect TON, leads to severe visual impairment with limited treatment options.
• Assessing prognostic signs is vital for managing patients and predicting visual recovery after optic nerve injury.
• Visual evoked potentials (VEP) are recognized for their prognostic significance in TON, but their role requires further exploration.

Purpose of the Study:

• To identify prognostic factors influencing visual outcomes in patients with indirect TON.
• To evaluate the specific role of VEPs in assessing the severity and prognosis of indirect TON.

Main Methods:

• A prospective observational study included 40 patients diagnosed with indirect TON.
• Ocular, neuro-ophthalmological, radiological, and neurophysiological (including flash VEP) variables were assessed at baseline and followed for six months.
• Statistical analyses included paired t-test, Pearson correlation, and univariate analysis to determine relative risks of prognosticators.

Main Results:

• Significant differences were observed in flash VEP parameters (P100 latency, N75-P100, P100-N145 amplitudes) between normal and affected eyes.
• Initial visual acuity and flash VEP variables showed a statistically significant correlation with final visual acuity.
• Negative prognosticators included poor initial visual acuity, higher relative afferent pupillary defect (RAPD) grades, abnormal VEPs, loss of consciousness, age >40, and lack of steroid treatment response.

Conclusions:

• Several negative prognosticators for indirect TON have been identified.
• These findings can aid in therapeutic decision-making and predicting visual outcomes for patients with indirect TON.