Which clinical feature of differentiates orbital apex syndrome (OAS) from superior orbital fissure syndrome (SOFS)?: (A) Proptosis, (B) Horner's syndrome, (C) Loss of vision, (D) Loss of ocular movements
Answer is C. Proptosis and loss of ocular movements can occur in both. Horner syndrome is more likely a feature of cavernous sinus syndrome which differentiates it from superior orbital fissure syndrome. As orbital apex syndrome affects optic canal , it causes loss of vision which differentiates it from SOFS.