This is an 13 year old girl with 20/40 vision OD.
1. What is the most likely diagnosis?
2. What are the four stages that describe the natural history of this disease and to which stage does this patient belong?
3. What makes up the "egg-yolk"?
4. What is the inheritance pattern?
5. How is the diagnosis made?
6. What is the visual prognosis for this condition?