Cataracts may develop in association with any condition that results in hypocalcemia. Hypocalcemia may be idiopathic, or it may occur as a result of unintended destruction of the parathyroid glands during thyroid surgery. Usually bilateral, hypocalcemic (tetanic) cataracts are punctate iridescent opacities in the anterior and posterior cortex. They lie beneath the lens capsule and are usually separated from it by a zone of clear lens. These discrete opacities may remain stable or may mature into complete cortical cataracts.
Excerpted from BCSC 2020-2021 series: Section 11 - Lens and Cataract. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.