·         TORCH infections- 36%

·         Idiopathic- 32%

·         Enzyme defects- 23%

                               Galactosemia

                               Galactokinase deficiency

                               G6PD deficiency

                               Homocystrnuria.

 

·         Familial syndromes- 9%

                                     Hallerman—Streiff

                                     Lowe’s

                                     Alport’s

                                     Conradi—HUnermann

                                     Smith—Lemli—Opitz.

 

NB- Congenital cataracts are seen as densely echogenic lenses in utero. Detection is usually achieved in the second trimester. The demonstration of clear lenses on sonography does not exclude the presence of congenital cataracts.