Baseline pressure is 28 & threshold is 19. No peripheral vision loss minimal optic nerve damage. Want to avoid eye drops. Can slt drop pressure to 19?

Possible. If you want to avoid drops, it is definitely worth trying slt first. Slt is a viable first line treatment for glaucoma. A 30% reduction in pressure is possible, which would bring your pressure down between 19 and 20. Even if you needed drops in addition to slt, you would require less drops to achieve your target pressure.