Yes, it is possible to have refractive surgery using new techniques if you have had RK in the past, but success will be limited by the number of RK incisions, the amount of irregular astigmatism (if any), the level of healing of the RK incisions, and many other factors.  It is possible to have wavefront-guided excimer laser ablation after RK, but that too is dependent upon many factors.  Many previous RK patients are very motivated to have refractive surgery to correct RK related visual quality aberrations, but the probability of success is very dependent upon the individual's circumstances.

Hyperopic shift is a known difficulty for RK patients. Additionally, patients at or beyond age 40 tend to have presbyopia. That is when the eye can no longer change focus from distance to near and you start to need reading glasses. Hyperopia and presbyopia are a combination that will eventually provide poor vision at almost all distances.

There is currently no surgery that can correct presbyopia predictably and safely, however there are some work-around techniques that may be appropriate, including monovision. 

It is possible to have Lasik after RK, but some alternatives should be considered before making this decision.  If the RK incisions have healed very well, there would be no problem with Lasik, but it is possible that the creation of the flap will cause too much stress on those incisions. In the worst case (and very, very rare) scenario, the flap falls apart like so many pieces of pizza. Even though this is a very low probability, if a surgical technique that does not require a flap is selected, the possibility of flap devastation is eliminated.

Advanced Surface Ablation (ASA) techniques PRK and LASEK (with an "E", not an "I") do not require the Lasik flap. The excimer energy is applied to the surface of the cornea, rather than under a flap of tissue. This will eliminate the need for a flap and eliminate all possibility of flap related problems.

CK is a less invasive technique that uses spots of radio waves in a ring around the cornea that causes the outer edge to shrink, and that provides correction for hyperopia. An added advantage of CK is that it provides a "blended" correction that often gives good distance and near vision. This is helpful for patients who are also presbyopic.

All hyperopic corrections tend to regress over time and also tend to fluctuate. A fully comprehensive examination would very probably be able to determine an individual's candidacy for refractive surgery after RK.

In all instances, hyperopic correction is less predictable than myopic correction. You know all those ads about the 20-Minute Lasik Miracle with perfect eyesight? Those are not hyperopes. They are also not hyperopes with presbyopia. They are also not hyperopic presbyopes with previous RK.

It is necessary to be objective and have reasonable expectations about what a previous RK patient will get from any refractive surgery technique. That said, hyperopes (especially presbyopic hyperopes) tend to be the most appreciative patients. Since hyperopic-presbyopic vision is so poor, even a moderate improvement is significant.

In many cases, RGP and other specialized contact lenses are successful in correcting RK related problems and providing superior vision.  Additionally, the CLAPIKS method of therapeutic treatment may be a better option than surgery.

Not every refractive surgeon will perform new refractive procedures on previous RK recipients.  If you decide to have additional surgery, be sure you select a surgeon who has this practical experience.