A simple and novel grading method for retraction and overshoot in Duane retraction syndrome
With the involved eye in adducted position, a straight line parallel to the intermedial canthal line is drawn from the pupillary center of the fellow eye.
0 Line bisects the pupil of involved eye.
1 Line lies between pupillary centre and pupillary margin.
2 Line lies between pupillary margin and limbus.
3 Line lies at limbus or over sclera.
4 Cornea disappearing below the lid (pumpkin seed sign).
Source : BMJ PDF
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