Abstract
Evidence in support of the active ion transport by the ciliary body epithelium as the major mechanism of aqueous humor formation (AHF) has been accumulated. This paper reviews the recent progress in research and discussion of the following topics;
i) the structure of the ciliary body epithelium
ii) the composition of the aqueous humor
iii) the contribution of active ion transport to AHF
iv) the active transport of Na, Cl and HCO3
v) the neural and humoral factors which affect AHF
vi) the possible role of pigmented cells on AHF
