A nurse is providing teaching to a group of clients about changes that occur when clients experience open-angle glaucoma. Which of the following statements should the nurse include in the teaching?
1) Increased intraocular pressure causes damage to the optic nerve.
2) Open-angle glaucoma is characterized by sudden vision loss.
3) Treatment for open-angle glaucoma includes surgery to remove the cataract.
4) Open-angle glaucoma is caused by a blockage of the drainage canals in the eye.