Cataract can be linked to glaucoma; often, collyrium used to treat glaucoma, results in accelerating cataract formation.

In some cases (e.g. Narrow-angle glaucoma), cataract surgery can improve eye pressure and become fundamental to properly treat glaucoma. By replacing the natural lens with an artificial one, it is possible to make more room inside the eye and this improves the intraocular liquids dynamic and the eye pressure.

Cataract surgery can help widen the camerular angle and allow a better laser treatment performance for glaucoma, called SLT or selective laser trabeculoplasty.

In case of advanced glaucoma, cataract surgery can be teamed up with another surgery to decrease eye pressure, performing two surgeries at once.