RARB and Cognitive impairment: Here we describe unrelated Japanese patients with distinct novel heterozygous retinoic acid receptor beta (RARB) gene variants underlying syndromic microphthalmia-12: case 1 with a frameshift variant, c.1205_1206del, had bilateral microphthalmia, corneal opacity, anterior segment dysgenesis, widespread multiorgan anomalies, hypotonia and cognitive impairment; case 2 with a missense variant, c.844G>T had Peters anomaly, extreme microphthalmia, spasticity, profound psychomotor delay and refractory epilepsy.