MS-3754

A 50-year-old man with type 2 diabetes comes in for a regular eye check-up. He reports no issues with his vision. However, during the visual field test, there is a slight loss of peripheral vision in his left eye.

Upon dilation of the pupils, you observe that the cup-to-disc ratio is 0.6 in the right eye and 0.7 in the left eye. Apart from this, the examination is unremarkable. You decide to prescribe timolol.

What is the mechanism of action of timolol in treating the patient’s condition?