Iris Heterochromia (ddx)

Benign idiopathic heterchromia (most common)
- genetic mosaicism or developmental variation
Ocular melanocytosis
Iris Nevus
Iris Melanoma
Iris Atrophy
- Trauma
- Fuchs' heterochomic iridocyclitis
  - Chronic unilateral anterior uveitis, iris atrophy and stellate keratic precipitates
Siderosis- intraocular hemorrhage or iron deposition from intraocular foreign body
Medications
- Chronic prostaglandin analogues in one eye in a partially pigmented iris
Horner syndrome- lack of pigmentation of iris in congenital Horner syndrome
Waardenburg syndome
Syndromic Hirschsprung Disease
- Hirschsprung disease with heterochromia