Obstruction to the outflow of aqueous humor; Which finding would support a diagnosis of glaucoma?

• A. Elevated intraocular pressure
• B. Decreased intraocular pressure
• C. Normal intraocular pressure
• D. Variable intraocular pressure

Answer: (A)

When the outflow of aqueous humor is blocked, drainage slows or stops while production continues, causing fluid to back up and pressure to rise inside the eye. This elevated intraocular pressure is what drives glaucomatous damage to the optic nerve, so a higher-than-normal pressure supports the diagnosis. In glaucoma, tonometry would show increased readings (often above about 21 mmHg). While some glaucoma cases can have normal or variable pressures, the obstruction scenario most directly leads to elevated pressure, making it the best indicator.