Unfortunately we have no cure for this condition. Therefore treatment is life long in order to prevent permanent vision loss and does not improve eyesight.
Broadly speaking treatment involves eye drops, laser or surgery.
For some cases of glaucoma, laser may be performed. This involves applying laser to the iris or trabecular meshwork which can allow aqueous fluid to flow more effectively within the eye, and drain better.
Source: Tunnel Vision. The economic impact of Open Angle Glaucoma, Centre for Eye Research Australia, 2008
Glaucoma.org.au is a useful resource with comprehensive information, click here.