CTNNB1 and Strabismus: From an ophthalmologic perspective, he was known to have retinopathy of prematurity in addition to cortical visual impairment and strabismus. CMA and methylation studies for Angelman and Prader‐Willi syndromes were negative. Trio whole‐exome sequencing detected a de novo frameshift variant in CTNNB1 (c.1665dupG, p.T556fs) that was thought to be diagnostic.