Blindness or loss of vision indicates involvement of the orbital apex, which is more serious, requiring urgent surgical intervention.
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Caption2 = 1 Foramen ethmoidale, 2 Canalis opticus, 3 Fissura orbitalis superior, 4 Fossa sacci lacrimalis, 5 Sulcus infraorbitalis, 6 Fissura orbitalis inferior, 7 Foramen infraorbitale
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