In chronic open-angle glaucoma there is damage to the optic nerve at the back of your eye. It is usually caused by an increase in pressure within your eye. Levobunolol eye drops work by lowering the pressure in your eye. They do this by reducing the amount of fluid that you make that fills the front part of your eye (called aqueous humour). By reducing the amount of fluid produced, it reduces the pressure within your eye.
This is a companion discussion topic for the original article at https://patient.info/medicine/levobunolol-eye-drops-for-glaucoma-betagan