The Glaucoma Therapeutics segmentation by type is anchored in three pharmacological classes whose revenue contribution is driven by efficacy, adverse-event profile, and price erosion from generics. Prostaglandin analogues (PGAs) command the largest share—over half of the 2023 market—because once-daily dosing and superior IOP-lowering (30–33 %) translate into high persistency, while branded reformulations such as preservative-free latanoprost retain pricing power. Beta-adrenergic receptor antagonists, once standard-of-care, now represent a mid-single-digit slice; generic timolol solutions exert continual deflationary pressure, yet preserved combinations sustain residual value in emerging markets. Alpha-agonists occupy a strategic niche, capturing roughly one-tenth of revenues; brimonidine’s adjunctive role in patients intolerant to PGAs supports stable volume, whereas brimonidine-timolol fixed-dose combinations defend share against generic monotherapies. Combined, these archetypes illustrate how market taxonomy pivots on clinical differentiation and lifecycle dynamics rather than incremental innovation.