The Shadow Sign

The Shadow Sign is a long, narrow shadow that you can create at the edge of the Optic Nerve in the nerve fiber layer, just inside the rim of the Disc in the Inferior Temporal Quadrant, using the light of the Direct Opthalmoscope. The intensity and size of the shadow varies according to the degree of the Glaucoma, but it is always a long and narrow shadow at the edge of the Optic Nerve, and not related to the Cup of the Optiv Nerve. You can detect this shadow two to three years before you can detect changes in the visual field as confirmed by Dr. Lawton Smith, Professor of Opthalmology at Bascom Palmer Eye Institute. The Shadow Sign is always present in Glaucoma cases.