Quantification of change in iris torsion using a smartphone
The present case appears in the journal Ophthalmology.

A 24-year-old man with intermittent exotropia had bilateral inferior oblique overaction. To assess the extorsion in the right eye, the authors clipped smartphone camera with a commercially available macro lens, following this, the camera is opened under an application containing 360-degree protractor.

Patient’s chin was rested along the chin rest of the slit lamp and anterior-segment images are captured by focusing the protractor at the center of the pupil.

(A) Preoperative and (B) postoperative images were compared by tracing any prominent iris crypt to calculate the approximate change in extorsion. (Fig 1A-B, white line indicates the change in torsion).

Source: https://pxmd.co/M1N87