Internal obstruction

Any of several diseases of the spirit pupil and inner eye manifesting in poor vision. Internal obstructions mostly occur in vacuity patterns and are most commonly attributable to insufficiency of the liver and kidney or dual depletion of qì and blood. Other causes include yīn vacuity with effulgent fire, qì stagnation and blood stasis, wind-fire and phlegm-damp harassing the clear orifices, and external injury. Signs include subjective sensations like mouches volantes, black floaters, lights and flames appearing to be surrounded rainbow-like halos, clouded vision, night blindness, or sudden blindness. Very often there are no visible objective signs, although the pupil may be dilated or contracted, deformed, or abnormal in color. Internal obstructions include green-blue wind internal obstruction and green wind internal obstruction (corresponding to glaucoma). Compare external obstruction.