The mission of the Naval Ophthalmic Support and Training Activity (NOSTA) is to support readiness of the Armed Forces by providing timely fabrication and worldwide delivery of quality eyewear. Additionally, retired military personnel, regardless of rank, are authorized one pair of standard issue spectacles or one pair of half-eye spectacles annually.
If you are less than 50 miles from a military medical clinic with optometry services, you should take your prescription for spectacles to them so that they may measure you for proper fit. They will order your spectacles from the appropriate military ophthalmic laboratory. You may also contact Customer Service during regular business hours with your questions.
http://www.med.navy.mil/sites/nostra/order/Pages/Retiree.aspx
You can get quality and fashionable eyeglasses from zennioptical.com for less than $10. Bifocals are more.
My eyesight is such that I have to wear progressive lenses. I have found a problem with them when shooting. When shooting a rifle and I bring my cheek down near the stock, the front sight looks bent or curved. These darn progressives are distorting my vision!
Go to the Zinni site, I bought 3 pairs of prescription glasses, aviator type, bi focal, tinted, total cost was about $110 (Titanium frames) Every now an then its a buy 2 get 3 sale. I take advantage of it.