Figure 2. Strabismus test of patient II:2 at five diagnostic positions. At the primary position, the right eye was fixed at the hypotropia
(HT) position, and the left eye was fixed at the esotropia (ET) and HT positions. Minimal vertical motilities and adductions
were noticed in both eyes. Notably, the right eye showed nearly normal abduction, and the left showed none. This patient had
undergone bilateral inferior rectus recession surgery at age 4.