Methods, compositions and kits comprising alpha-adrenergic antagonists, such as phentolamine, for the treatment of glaucoma, ocular hypertension, and/or other ocular disorders, such as non-arteritic anterior ischemic optic neuropathy or keratoconus, are provided. Said methods, compositions and kits may further comprise additional therapeutic agents, including prostaglandin analogues such as latanoprost, beta-adrenergic antagonists, alpha-adrenergic agonists, carbonic anhydrase inhibitors, cholinergic agonists, NMDA receptor antagonist, adenosine receptor antagonists, 5-HT2a receptor agonists, or Rho kinase inhibitors.