Fig. 2

The green circle marks the border of the iris and the green cross shows the center. The red dot is the corneal reflection. In a, the distances between limbus center and corneal reflection (DLR) of each eye are equal and small (0.38 mm for OD and 0.49 mm for OS). Both corneal reflections are located nasal to the limbus centers with no obvious strabismus measured. In b and c there are substantial differences in DLR. In b, 0.28 mm OD and 0.83 mm OS, with a strabismus angle calculated at 10.51△ (exodeviation). In C the corneal reflection is located in different sides of the iris center and the strabismus angle is calculated at 20.19△ (esodeviation). b shows a suspected exotropia while (c) is a suspected esotropia