A 25-year-old lady presents with sudden severe bilateral loss of vision, more so on the right side, with no perception of light. Rest of the examination including pupillary reflexes, fundus and optokinetic nystagmus are normal. She was able to touch the tips of her fingers with her right eye closed but not with her left eye closed. The most like1 tgnosis is:
Optic neuritis
Anterior ischemic optic neuropathy
CMV retinitis
Functional vision loss
Ans. d. Functional vision loss (Ref Kanski 6/e p 477, 790, 792-793)The most likely diagnosis in this young lady who presents with sudden severe bilateral loss of vision, more so on the right side, with no perception of light and normal examination findings including pupillary reflexes, fundus and optokinetic nystagmus, who is able to touch tips of her finger with right eye closed but not with left eye closed, is functional vision loss.