High myopia causing bilateral abduction deficiency.

We present two cases of degenerative myopia with abduction deficiency. Three mechanisms can explain the defect in the abduction: (a) the size of the long globe filling the space of the orbits, (b) the tightness of the medial recti due to long axis of the globe, and (c) longstanding esotropia becoming decompensated later in life. We believe that high myopia is not a well-known cause of abduction deficiency, and it should be considered in the differential diagnosis.