Metabolic cataract is loss of lens transparency caused by an insult to the nuclear or lenticular fibres due to an underlying metabolic disorder. They may present as an isolated condition or as a part of a particular syndrome. Most of the times being considered as a part of a congenital syndrome, the exact incidence of this cataract is unknown. Screening for underlying metabolic disorders in children with bilateral cataract can lead to their early detection and avoidance of consequences with timely initiation of treatment [1, 2]. The metabolic disorders have been divided according to the age of appearance of cataract (Table 3.1). This may be helpful in the differential diagnosis of inborn errors of metabolism presenting with cataracts. Also, specific lens changes seen in different disorders provides diagnostic clues [1–3]. Few of these disorders are described here in detail.
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