亲历准分子手术全纪录

xblues

http://gizmodo.com/5051492/video-what-lasik-really-feels-like




04:02 (14 hours ago)
Video: What LASIK Really Feels Like

                               
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from Gizmodo: Top by Brian Lam

                               
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  Thenurse applied a series of numbing drops to my eyeball, each strongerthan the previous. The doctor clamped my lids back with a metal tool. Ifelt a bracket hold my eye down and someone in the operating room gavethe order, "Suction."
A whirring sound commenced and my eyeballfelt like it was being sucked up and out of my skull, elongated like agreen grape between a Roman emperor's fingers, ready to burst. Thebright blue-white light grew closer. As the pressure killed circulationin the eye things went black and I felt an arcing slice in the surfaceof my cornea—I did not move my jaw or tongue or mouth, but deep in mythroat I uncontrollably whimpered, "THAT HURT!" and hoped no one heardme. I hoped the other eye would not feel the same. It did not, as thedrops had actually taken full effect by the time it was sliced openwith a beam of light. The rest was, as they said in the brochure,physically painless.
A few days earlier on Linda Del Mar beach,a wave knocked me off my longboard. Under the turbulence, both contactlenses were flushed out of my eyes. It was impossible for me to catchany more waves with the remainder of my eyesight. Although I'dentertained the idea for years on and off, it was right there that Idecided to get LASIK done as soon as I could. A friend told me he'd hadgood success at LasikPlus. Coincidentally, my vision plan gave a heftydiscount there, so I figured I would try them out. It was them or theLASIK doctor from Family Guy:
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Iwent for a free consultation. Their office was like any other doctor'soffice, with one exception. In the middle—behind a giant glass windowthat everyone in the waiting room could see—was an operating chairsituated in between giant boxy machines. They had overhanging beakspositioned as if ready to feast on whoever was strapped into the seat.
Theoptometrist concluded I was a good candidate for the surgery, based onhaving light to middle nearsightedness, slight astigmatism andotherwise healthy eyes. She showed me a brochure with all the options Icould get: The $900 base package uses a scalpel to cut open the corneaand then a broad UV laser whose every zap removes tissue 1/500th of ahuman hair in thickness. I opted for the $2000 package, which openedthe cornea with a laser instead of a scalpel and tracked a custom mapof my eye's irregularities, treating it sector by sector. Thiswavefront guided analysis is the same tech NASA used to detect andcounter irregularities in high-powered telescopes. This would reducehalos around bright lights and "dramatically improve vision." Accordingto a study I do not know enough about to believe, it was more likely tobetter than 20/20 vision with such a package than without. The Navyrecommends this version of LASIK for its aviators. And if it's goodenough for Top Gun, it was good enough for me, regardless of cost.(These quotes are per eye.)
I was surprised to discoverwhen I went in later that others were getting the basic surgery. Iwinced as one lady's eye was cut by a scalpel in a device akin to acarpenter's plane. Another lady—whose husband was getting it laterdepending on how hers went—complained about night vision problems butdidn't opt for the costlier halo-reducing procedure. I found thisastounding considering the banners on LasikPlus's site offering 0%financing.
Someone asked the nurse what the difference wasbetween the cheap and the expensive LASIK and she said something thatmight not have been exactly endorsed by the company: The expensive onewas like high-definition TV and the cheaper one was likestandard-definition, but they both get the job done. I thought tomyself, "Like hell standard definition gets the job done!" Yet everyonein the room nodded as if they were still using VHS at home.
Onthe Saturday before the lasering, I had gone surfing with my contactsbut was told to wear glasses for the next three days to ready my eyesfor the operation. Hard lenses need to be left out for 4-6 weeks beforesurgery since they greatly affect the shape of the eyeball.
Wearingmy glasses again, I appreciated the nice titanium frames and ultrathinglass. I realized there was a lot to be said for how glasses made mefeel. In 7th grade, I'd noticed difficulty making out the blackboard,but avoided getting them and got through math class by squinting. Theteacher reported me to the nurse, and I got stuck with some hideousgold colored ones with horn rimmed earpieces. I felt self conscious inthem, almost diminished.
That feeling went away as I grew up andearned some nerd pride, but I have always allowed myself to say geekierthings and do more socially awkward things when wearing them. I couldfutz with my phone instead of carrying on in a group conversation, pushmy glasses up my nose and laugh slightly louder than usual at slightlystupider things, and expect people to chalk it up to nerdiness. I thinkI might miss this, for all the advantages of having laser-enhancedvision.
On the day of the operation, the doctor spoke to thepatients in the waiting room. The entire procedure would take about 15seconds per eye. There was nothing we could possibly do to cause thesurgery to fail, but please do not shake our legs. (?!?) Lisa asked meat least 5 times if I was scared. It made me wonder if I looked scared,because I didn't think I was scared and if I looked scared that means Iwas so scared I didn't even realize it. Which all freaked me out. A lot.
Oncemy corneas were cut open and I experienced that initial pain, I wasdefinitely frightened, and escaped to a corner of my mind where I wouldnot think too much about all the things they were doing to my eyes andwhat my life would be like if I happened to be the "less than 1%" ofpatients with vision-reducing complications.
I was already inthis mental cone of silence when the doctor lifted up the covers of myeyeball flaps using what looked like metal chopsticks, mixing around astir fry while I watched, first-person perspective, from within thewok. I was shifted under the largest machine in the room, its eye aflashing red/orange light. It reminded me of a Discovery Channelfeature on exploding stars. There was a sound, a clicking like thatfrom a Tesla coil, and the smell of ozone, which went on for 15 secondsas the nurse counted down. My eyes were clamped, and I felt I was beingburned alive (even though LASIK's UV laser does no thermal damage totissue). I was told not to attempt to move or blink, which of course,makes you move and blink. The muscles in my eye fought the devicesholding me steady, and before I could calm myself down, the laser hadalready stopped.
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Thedoctor finished my second eye, and had me sit up. There was fogeverywhere and contrast was abysmal, but my vision had improved bymeasures of sharpness. I slept in the car ride home as Lisa drove, andas the painkillers wore off. The hard part began: I was to avoid alloptical stimulation and sleep the rest of the day. At one point, Icould handle it no longer and I checked my email. All of it.
Iwas told that the next morning I would have a miraculous, life-changingexperience as I woke up without any need for glasses or contacts.Actually, it was not so miraculous. My healing eyes could see somewhatsharply but with a lot of haze. It was similar to sleeping with mycontacts in. I took off the racquetball-style eye shield I was to sleepwith for a week, and began the steroid and antibiotic eye-droptreatment, which I'd also keep up for a week. I got dressed and wentfor my check up appointment. And that was when the miracle happened.
Igot in front of that damn eye chart and, even through the haze, smokedthe exam's 20/20 line. Had my eyes been clearer, I would have read theletters on the 20/15 line, too. Not bad for $4K, a laser in my eyes forless than a minute and a day's worth of healing.
After I getused to the sharpness, I am sure I will be worried about being one ofthe few percentage of people who walk away from LASIK dissatisfied.(Wikipedia cites four studiesthat indicate post-op satisfaction anywhere from 92% to 98%, but that'sstill a lot of people pissed off.) Even if things go perfectly, theysay it will take 3-6 months to heal completely, during which my visionwill be irregular. Eyeballs might be dryer at times than I'd want themto be.
None of this bothers me much, save the fact that newer,better, safer technology will come around sooner or later, and my eyesmay end up as out-of-date as back-to-school iPods. And I do not know ifmy eyes will be forward-compatible, having already been sliced. Still,for now I remain top-of-the-line, and I would gladly endure 10 timesthe (mostly imaginary) pain of LASIK to gain the quality of eyesightfound in elite Major League Baseball pitchers.
[Thanks to Lisa for feeding me, driving me home and taking that video.]

xblues

LASIK全称为准分子激光原位角膜磨镶术（Laser in situ keratomileusis）。医生利用准分子激光能够精确切削组织的特性，用准分子激光束重塑角膜的曲率达到矫正近视的目的。其方法是用显微板层成形系统掀开一个角膜瓣，在瓣下角膜基质层上用准分子激光根据近视、散光度数进行精确切削。医生在治疗前将患者术前检查的数据通过智能病历卡输入计算机，由计算机来控制激光在角膜中心削出一个光滑的曲面，相当于在角膜上切削出一个眼镜片，使光线能够直接聚焦于视网膜上，视力变得清晰。

flyday

will u  follow him?

xblues

  I am not a qualified patient for this surgery. My corneas are too thin, the doctor told me after she ran the checking for three times.

flyday

  you need a new techlogy