Aqueous humor secretion

Aqueous humor secretion is the physiological process of producing a clear, nutrient-rich fluid within the eye's ciliary body, which is critical for maintaining intraocular pressure (IOP) and the eye's spherical shape [1, 2]. This fluid serves as a vital blood substitute for avascular ocular structures, providing essential nutrients like oxygen and glucose to the cornea and lens while removing metabolic wastes [1, 6]. The secretion occurs primarily in the ciliary processes through a complex mechanism involving active transport, ultrafiltration, and diffusion, mediated by a specialized double layer of ciliary epithelium [12, 15]. In pathological states such as glaucoma or ocular hypertension, an imbalance in this secretion or a decrease in its outflow leads to elevated IOP, posing a significant risk for irreversible optic nerve damage and blindness [3, 7]. Pharmacological management of these conditions frequently involves suppressing secretion by targeting molecular components within the ciliary epithelium [2, 15]. Primary therapeutic targets involved in this process include carbonic anhydrase II, beta-2 adrenergic receptors, and alpha-2 adrenergic receptors [8, 17]. By modulating these targets with drugs like timolol or dorzolamide, clinicians can effectively lower IOP and preserve visual function [4, 15].

Other names

Aqueous humor productionAqueous humor formationCiliary body secretionAqueous inflow

Reduction of aqueous humor production through the pharmacological inhibition of carbonic anhydrase or the modulation of G protein-coupled receptors (beta-adrenergic and alpha-2 adrenergic) in the ciliary epithelium.