Hi welcome to health care magic.... You are not having headache and complaint of vision blackout.... So your blood pressure first has to be measured.... Than your detail neurological examination done... As this type of presentation can occur if optic neuritis like condition occurred... Blood sugar estimation also done... If needed your ophthalmoscopy examination has to be done.... According to cause further treatment will be decided.. Like if inflammation present than short term steroid given... Take care Advise : Consult physician for examination and further work up....