<prompt> Cataract is NOT seen withSteroidsVitamin B12 deficiencyDiabetes mellitusHomocystinuria  <response>: B Vitamin B12 deficiency CAUSES OF CATARACT Age: Age is the most common cause Trauma: Blunt trauma, Electrical injuries Radiation: Ultraviolet light: glassblowers, Lasers Genetics Chromosome abnormalities associated with cataracts -- 1 q21.1 deletion syndrome, cri-du-chat syndrome, Down synd ome, Pataus syndrome, trisomy 18 Edwards syndrome, and Turners syndrome, and Neurofibromatosis type 2. Examples of single-gene disorder -- Alports syndrome, Conradis syndrome, myotonic dystrophy, and oculocerebrorenal syndrome or Lowe syndrome. Skin diseases: Atopic dermatitis Eczema: Ichthyosis cuneiform cataracts; Basal-cell nevus Pemphigus Smoking and alcohol Medications: Corticosteroids, Antipsychotics, Miotics Post-operative: Vitrectomy, Cataract Surgery Metabolic and nutritional diseases: Aminoaciduria or Lowes syndrome, Diabetes mellitus, Fabrys disease, Galactosemia galactosemic cataract, Homocystinuria, Hyperparathyroidism, Hypoparathyroidism, Hypervitaminosis D, Hypothyroidism, Hypocalcaemia, Mucopolysaccharidoses, Wilsons disease Congenital: Congenital syphilis, Cytomegalic inclusion disease, Rubella, Cockayne syndrome Genetic syndromes: Down syndrome, Patau syndrome, Edwards syndrome Infections: Cysticercosis, Leprosy, Onchocerciasis, Toxoplasmosis, Varicella Secondary to other eye diseases: Retinopathy of prematurity, Aniridia, Uveitis, Retinal detachment, Retinitis pigmentosa 