Differential diagnosis checklist
Physical exam   Wikipedia  
A and C stand for Acquired and Congenital
VITAMIN stands for:
Vascular
Inflammatory (Infectious and non-Infectious)
Trauma/ Toxins
Autoimmune
Metabolic
Idiopathic
Neoplastic
Example usage: List causes of decreased vision: Central retinal artery occlusion, Retinitis pigmentosa, Perforation to gobe, Chronic Gentamycin use, Ruematoid arthritis, Diabetes, Idiopathic, Any eye tumor, Myopia.

 Mnemonic:
"A VITAMIN C"