I also had PRK after RK surgery, age 52. My RK surgery was also done nearly 20 years ago in both eyes. Target - distance vision.

20/25 is great vision! The vision may continue to become more crisp/sharp as the eye heals and your brain adapts to the monovision. It is probably too early to consider any retreat options especially with a VA of 20/25.

It's possible you have some small prescription at this point. Usually the surgeon will be monitoring that. With PRK, the way the steroid drops are dosed after the surgery can be manipulated to adjust the final prescription. If the vision is worse but not correctable by prescription you need to...

Monovision usually reduces glasses dependence but there are situations at distance or at near where glasses might be needed. The problem with monovision is what works well at age 45 sometimes doesn't work will at age 55 or 60. However, it usually is effective for more than 3 years. Contact lens...

Contact lenses have a reshaping effect on your cornea, especially if you wear them longer than 8 hours a day. The instruments used to take your corneal maps and measurements are very sensitive. Therefore, contact lens use will affect your measurements for surgery. However, at our office, we...

It is hard to confirm if you have ectasia without looking at your corneal maps. Crosslinking is typically done to strengthen the cornea when there is steepening.I would return to your doctor for an evaluation. 

Enjoy your cup of coffee, more likely to get dehydrated at the gym.  I am not sure why you were told to avoid caffeine, but at this point in your recovery, I think you deserve a Starbuck's!