Abstract
The patient is a 49-year-old male who complained of diurnal variation of visual acuity in his left eye for one year. CTscans showed left ethmoidal sinusitis without other abnormal findings in his left orbit. After parasinuectomy in his left side, clinical symptoms and signs have been improved. Although the mechanism of diural variation of visual acuity in this case has not been confirmed, the case was infered to be rhinogenous optic neuropathy.
