Although often asymptomatic, optic disc drusen may lead to potentially vision-threatening complications. Some researchers suggest effectiveness of pressure-lowering therapy in prevention of visual field defects progression, in particular in patients with drusen and elevated or borderline intraocular pressure. Due to the morphology of the optic disc with drusen, assessment of the neuroretinal rim is very difficult and other diagnostic tools are necessary in taking a decision about treatment initiation. A case of a female patient is presented in whom a new type of perimeter – Heidelberg Edge Perimeter (HEP) with a flicker defined form (FDF) stimulus confirmed functional defect earlier than usual and proved to be useful in reaching a decision about treatment, despite normal intraocular pressure values.
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