Part one (first 30 slides) will be epidemiology (illustrated by cataract and by toxoplasmosis, which is often masked by cataract),   and diseases whose disability is sometimes worsened by synergy with a second disease.

Part two will be diseases that are gradually being controlled and diseases associated with environmental causes.

Part three will conclude with some �exotic� diseases most often seen in the tropics, zoonotic diseases, and iatrogenic diseases more common in tropical conditions.