valleys

My understanding is that persons with deep valleys (optic nerve entrances) have an edge when it comes to IOP vs Glaucoma. Is this true? Does anyone know. I have had deep valleys all my life, and my pressures have always been on the high side. Recent IOPs range from 20 - 25. My doctor does not think we should rely on my deep valleys, and so has had me on Travatan for several years. Deep valleys also seem to accentuate my depth perception. Any comments?

Dave