: Refractive changes may be caused by systemic diseases such as diabetes mellitus, lupus erythematosus, or hypothyroidism. However, refractive changes following the removal of a brain tumour have not been reported. In our case report, we describe a young woman without any systemic disease. She came to the emergency department in our hospital, where she reported a headache on admission and no other difficulties. Vital computer tomography was performed at the emergency outpatient clinic. The frontoparietal round hypodense lesion with an indicated dense margin - suspicious abscess, was detected. The patient was admitted to the Neurological Department of Slovak Medical University to have her condition diagnosed. After magnetic resonance, she was admitted to the Neurosurgery department, she underwent a neurosurgical procedure, where the diffuse anaplastic glioma grade II was histopathologically confirmed. Afterward, she reported worsening of vision. We diagnosed transient myopia, which is a rare condition. One month after the procedure the patient's eyes were again emmetropic without any harm on eyes.