Q: A few months ago, I knew about a new surgery procedure, similar to lasik just just with the difference that the computer follows the eyes movements, making the risk smaller. I just like to know the name of this procedure and how is this exactly made. Thank you very much. A: Most lasers used to perform lasik nowadays have trackers, which follow the eye as it moves. There is also wavefront software, which treats the eye is many different locations with slightly different prescriptions. Andrew Caster, MD

Q: I am currently 31 years old and underwent LASIK surgery in November of 1999 to correct my ¿4.25 vision. My vision for the past five years has been great. However, over the past year I have noticed that the nearsightedness is returning. I now have to wear glasses for driving at night. I am seriously considering having the procedure performed again. Are there any consequences with undergoing another LASIK procedure? A: If there is adequate corneal thickness and the other parameters are normal, enhancements are a safe and effective treatment. Andrew Caster, MD

Q: Dear Dr. Caster, I just want to know if there is any cases of people getting AIDS from custom lasik surgery? A:  No, I have never heard of that. Andrew Caster, MD

Q:  I am 41 and wear contact lenses and glasses. I can read with my glasses on with no problem. I have heard that after the surgery there is a good chance I will need to wear reading glasses is this true. please explain! A: No, your vision after the procedure should be like it is with the glasses on at both distance and near. When you get older, with or without the surgery, you will develop presbyopia. Andrew Caster, MD

Q: I had lasik surgery 24 days ago and my left eye especially is still very blurry. I am starting to get concerned that this is the vision I will be left with as there has been very little improvement in the past three weeks. My vision is no where close to being what it was previously with corrective lenses. I am currently testing at -1.5 and -.5. This is a dramatic improvement from -7.5 and -7 but the blurriness seems almost separate from my perscription, if you understand what I mean. Should I start to reconcile myself to the fact that I may still need to where corrective lenses or is there still hope this blurriness will recede? Thank you. Karen Friesen A: I hope and would expect that it was carefully explained to you that enhancement procedures are sometimes necessary, and this may apply to you. It is very easy to perform an enhancement procedure. Andrew Caster, MD

Q: I plan to have basic surgery via the Nidek 5000 laser (Myopia -4.75 both eyes and slight astigmatism). How has this machine performed? How long will it take the flap to heal? I am also considering whether to pay extra for a year's worth of enchancement (if necessary), what are the chances that my vision will change or need to be corrected within a year? I heard that changes mostly happen in the year. Thanks. A: The Nidek machine produces very good results for that range of nearsightedness and astigmatism. Most enhancements are performed within the first year. Andrew Caster, MD

Q: I recently decided to look into LASIK vision correction. One of the places I went performed a series of eye tests to determine my suitablity for LASIK. After testing I was ushered in to see the "Dr." and he checked my eyes. While doing so he made a series of comments, to himself, like "yeah I think i see it . . ." Then he tells me I have thinning corneas. Just one year ago I had an complete eye exam and was not infomed of the thinning corneas. What should I do from this point? A: Corneas do not progressively thin, so you had the thin corneas a year ago, but this test is not commonly performed and is not important unless you are comtemplating surgery. I would get a second opinion regarding your suitability for laser vision correction. Andrew Caster, MD

Q: Dear Dr. Caster, I had lasik surgery about 3 years ago. My vision is around 20/25, slight myopic. I just want to know should I have another lasik surgery? Do you think the PRK surgery is the best option? I want to have the Custom lasik , but I heard there were complication with the flap. Wth the custom lasik, will they open the old flap? Can I tell the doctor that I want better than 20/20? A: With Lasik as an enhancement, with custom or conventional software, it is best if possible to lay back the old flap. PRK will be better in some cases; you would need a consultation to determine which is best. Flap complications can happen but are very rare and usually easily treatable. Andrew Caster, MD

Q: I am a 59 year old female who has worn rigid contacts for 40 years. I have toric lenses and was told i could not wear soft lenses becaus of astigmatism. could lasik surgery be an option for me? A: Yes, absolutely. Andrew Caster, MD

Q:  l have hear that post Lasik surgery that people often have cloudy vision, see halos around lights, and experience light sensitivity. What causes these reactions? What is the usual treatment? And how long should this typically last before becoming concerned that something is wrong? Thank you. Sharon Fisher A: It is common to have these side effects, to a varying degree, for up to three months, sometimes even more. You should be seeing your doctor on a regular basis and should discuss your specific situation with the doctor. Andrew Caster, MD