One hundred and fifty-two patients with the Williams-Beuren syndrome were examined to assess the frequency and severity of ophthalmological features associated with the disorder. Eighty-two (54%) had strabismus, all but three, esotropia. One hundred and seventeen (77%) patients had blue irides, 10 (7%) green, and 25 (16%) brown. One hundred and twelve (74%) showed a typical so-called stellate iris pattern of the anterior stroma. Whitish anomalies were also detectable in brown irides. Two 9-year-old patients and one 46-year-old patient had initial cataract. Of all the patients with funduscopy, 22% had retinal vascular tortuosity. One patient had suspected Rieger syndrome. Two patients had ptosis, one with a Marcus-Gunn phenomenon. No ocular manifestation of hypercalcaemia was noted.