To search further for the role of the 13-nucleotide deletion in SSTR5-AS1, targeted PCR was performed in 104 unrelated patients with idiopathic superior oblique muscle palsy as well as 233 unrelated patients with esotropia (n = 117) or exotropia (n = 116), which served as the control (Table 3). Here, SSTR5 is linked to Esotropia.