I went through this 10 years ago and found a solution that worked well for me.
First, my optometrist wrote a prescription for me that was my regular prescription but modified it so I could see my best from 2 to 10 feet (pool playing environment).
She referred to this change in my prescription as "pulling back the field of vision". This made everything very clear and sharp in the 2 to 10 foot range and a little fuzzy further out (my vision is pretty basic myopia, short sightedness with a slight stigmatism).
I then went to one of the online sites where you can order your own lenses and frames, all you need are the numbers off of your prescription. You just key in the prescription. The optometrist doesn't have to call in or verify anything.... really simple process. You can pick a frame that is more applicable to playing pool. This would be a frame that would probably have a higher vertical measurement for the lenses... as described in previous posts.
There are many styles to choose from and they are much cheaper than buying from the optometrist or from a retail store. Also, you can add all of the other features as desired, such as tint, hardened lenses, scratch resistance, etc if you want. A basic pair of no frills lenses and frame was $15 + $10 shipping (I know, hard to believe)... I'm sure it costs more these days.
Here are a couple of on-line sites to get inexpensive glasses;
http://www.zennioptical.com/
http://www.choiceeyewear.com/
This has worked very well for me. Also, now when I get my eyes checked, my optometrist gives me my regular prescription and she gives me my pool prescription at no addition charge. She doesn't have to check my eyes twice, she just makes the necessary change from my regular prescription to come up with my pool prescription.
Regards