A child presents with painful sudden loss of vision. He also complains of pain on ocular movement. Most likely diagnosis is: (AIPG 2010)
|D||Optic nerve glioma|
1. Retrobulbar neuritis is the inflammation of retrobulbar intraorbital part of optic nerve.
2. As the inflammation remains confined to the retrobulbar part, no ophthalmoscopic signs are seen.
3. Acute retrobulbar neuritis presents with sudden and marked loss of vision which is unilateral.
4. Ocular movements are painful.
5. The pupil reacts to light but the contraction is not maintained and it slowly dilates again even in the presence of bright light. Such ill sustained pupillary reaction is known as Marcus Gunn Q pupil.
6. The depth perception of moving object is impaired (Pulfrich's phenomenon). Central and centrocecal Qscotoma is found.
7. Course is rapidly progressive. In weeks but in most of the cases there is spontaneous and complete recovery. Disease has a tendency for remission.