Q: My prescription is relatively high - in the "mid-600s" in both eyes. I have been told that custom lasik is not approved for prescriptions of my severity yet. So, I am struggling with the decision of whether to get convnetional lasik now, or wait for approval of custom for my prescription. So, the two key questions are: 1) Is there any known timeline for when custom lasik would be approved for my prescription? 2) In your medical opinion, is custom lasik worth waiting for - that is, is it that much better than conventional lasik? Thanks! Brian Fischbeck A: Custom Lasik is slightly better. Not a huge difference, only subtly better. The Alcon Ladarvision laser is now approved for custom wavefront up to -7.00. Andrew Caster, MD Beverly Hills, California

Q: Recently, i have just changed my contact lenses and i dont know how but im not very sure now which lense is for the right and which is for the left. I wear -2.50 for the left eye and -1.75 for the right eye. Am i able to know which one is for which just from the size of the lense? A: You will need to ask your eye doctor which lens is for which eye. Andrew Caster, MD Caster Eye Center Beverly Hills, California

Q: I have a six month old son who I stopped nursing on 10-01-04. When is it possible for me to get a customvue lasik. A: Most doctors recommend waiting 2 months or so. Andrew Caster, MD Caster Eye Center Beverly HIlls, California

Q: Because I have thin corneas, I was told by one doctor that the best procedure for my vision correction would be Lasek or PRK. Another doctor said I was a candidate for Intralase. It is my understanding that Intralase has less complications, pain and risks, but I was told that Lasek or PRK would be a better option for thin corneas. What would you recommend? If at some time I were to need an enhancement after the Intralase surgery, would I be at risk in some way because of the thin cornea situation? How long would it take a flap to heal and can it be accidentally lifted years later? Thanks for your time! A: What is best for you depends on your precise corneal thickness, eyeglass prescripton, etc. Andrew Caster, MD Caster Eye Center Beverly HIlls, California

Q: I had wavefront lasik 3 weeks ago. I was overcorrected, I had been nearsighted but now I am farsighted and can't see near or far without correction. My eyes (especially my left eye) ached. I have halos (even during the day when something is in bright sunshine) starbursts and double vision. What went wrong? My optometrist said my corneas were pretty flat now and even the flattest contacts don't lay flat enough. I do wear them to see though when I'm not wearing my reading glasses. A: Things should improve as futher healing takes place. If the vision does not return to the level that you desire, an enhancement surgery should be preformed. Andrew Caster, MD Beverly Hills, California

Q: Three months after my (conventional) Lasik, I am undercorrected, but that is not my primary concern. I have ghosting problems at night and in dim light and I have trouble seeing detail in dim light. Is there any treatment available for this? Thanks, Albert Chang A: Poor vision in low light will often continue to improve, even for one year or more. Fixing your undercorrection should help as well. Andrew Caster, MD Beverly Hills, California

Q: My young niece has lost both her natural eye lens due to a genetic disease that caused rejection of the lenses. Is there any way to restore sight when this happens? Right now she has removable contacts and glasses that are really thick. I thought maybe there might be some plastic lens that might work and her body would not reject that material. Thank you for considering the question. Martha A: Implants of lenses inside the eye are often possible. Andrew Caster, MD Beverly HIlls, California

Q: I had lasik surgery one year ago,but my vision is not completly treated. my right eye is - 0.50 with no astigmatism . my left eye is +50 WITH THE ASTIGMATISM OF 0.50.i am thinking about another lasik surgery.is it possible? A: Yes, it is possible, and should help you a great amount. Andrew Caster, MD Beverly Hills, California

Q: Just had lasik 4 days ago..my vision before lasik was -6.5 and -5.0..i am undercorrected now about -1.00 on each eye...i asked dr what setting was on laser for correction and it was approx 20 less than my orgingal prescription. he said that was due to my age(57). is this correct procedure to undercorrect because of your age.? thanks john A: Each doctor has his or her own system. I think that it is proper to inform people ahead of time if you intend to purposefully undercorrect them. Andrew Caster, MD Caster Eye Center Beverly HIlls, CA

Q: Dear Sir, I am a 15 year old Australian high school student,currently working on a medical technology assignment. The question i need answered : What impact and affect will Lasik surgery have in the future? Looking forward to your reply. Thank You Matthew Kafer. A:  I think that Lasik will continue to be the most commonly performed surgery each year in the United States, as well as in other countries. It should only continue to have a greater and greater impact each year. Andrew Caster, MD Caster Eye Center Beverly HIlls, California