Optical coherence tomography is less sensitive than visual evoked potentials in optic neuritis.

Area of Science:

• Neuro-ophthalmology
• Neuroscience
• Medical imaging

Background:

• Optic neuritis (ON) is an inflammatory condition affecting the optic nerve.
• Assessing subclinical ON and its relationship to visual function and disease severity is crucial.
• Optical coherence tomography (OCT) and visual evoked potentials (VEP) are used to evaluate optic nerve damage.

Purpose of the Study:

• To determine the utility of OCT in detecting clinical and subclinical remote ON.
• To explore the relationship between OCT findings, clinical ON characteristics, and visual function.
• To assess if retinal nerve fiber layer (RNFL) thickness measured by OCT can serve as a surrogate marker for global disease severity.

Main Methods:

• A cross-sectional study involving 65 subjects with a history of ON at least six months prior.
• Data collected included clinical ON characteristics, visual acuity (VA), contrast sensitivity (CS), OCT, and VEP.
• Analysis focused on the sensitivity of OCT and VEP in detecting ON and correlations between RNFL thickness and visual/clinical parameters.

Main Results:

• VEP sensitivity (81%) was superior to OCT RNFL sensitivity (60%) for detecting ON.
• Subclinical ON was present in 32% of unaffected eyes, predominantly identified by VEP.
• RNFL thickness correlated with VA and CS but not with overall disability or demographic factors.

Conclusions:

• VEP is the preferred method for detecting clinical and subclinical ON.
• OCT measures of RNFL thickness are not reliable indicators of overall disability or prognostic factors in MS.
• OCT can offer complementary data to VEP and is valuable for research in optic nerve diseases.