With glaucoma at age 58, it is hard for me to understand how i will be able to preserve my vision for 30 years. won't this be difficult?

Not necessarily : It mostly depends on how advanced your glaucoma was when first diagnosed and detected. Unless the disease was very advanced, i see no reason why you should not be able to preserve your vision for your lifetime if you follow your doctor's recommendations and use your medications as directed. Glaucoma is by nature progressive, so the goal is to slow that progression to a crawl. We have great medications and surgeries to help. Compliance is very important.

Slow adaptation: Open angle glaucoma is a slowly progressive disease that can be treated medically and surgically. The goal is to slow down or arrest the optic neuropathy usually associated with elevated intraocular pressures. Along the way, small adaptations with better task lighting, magnification devices and behavioral change will enable you to remain independent . Visit a vision rehabilitation specialist.