LASIK
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What is LASIK?
Lasik is the ultimate wayof correcting nearsightedness, or myopia.
People with myopia usually have abnormally long eyeball. Like a poorly focused camera, one can't see well with a myopic eye because entering light rays are focused in front of the retina (a layer of light sensitive tissue). Eyeglasses, by bending the incoming light rays, compensate the mis-focusing .
Lasik surgery carves the curvature of your eyeglasses onto your cornea, the front part of your eyeball, which is similar to the lens of a camera. Unlike the previous generations of surgical correction of nearsightedness, Lasik surgery combines precision, simplicity, safety and speed of recovery.
Am I a suitable candidate for LASIK?
Before any surgery, you must first be seen and examined by both an optometrist and an ophthalmologist. Working together, they will decide whether you are fit to receive the surgery, and to explain to you all the positive and potential negative effects of the surgery on you.
What happens during the LASIK surgery?
The surgery typically takes less than half an hour (including the preparations), but the actual operation only takes around 15 minute or so. Lasik surgery is made up of two steps
Is LASIK a painful procedure? What should I do to facilitate the procedure?
Throughout the surgery, you are fully awake. You can feel the doctor touching your eyes; but the pain sensation is absent by the anaesthetic eye drop. The surgery began with instillation of an anaesthetic and an antibiotic eye drop. These will ensure the procedure to be painless and clean. Next, the doctor will put in a small device called a lid speculum to hold your eyes open throughout the surgery. You can blink normally without affecting the surgery because the lid speculum will prevent you from being able to close the lids. Small amount of eyeball movements is not a problem because the computerized laser machine can detect and compensate such. To help you keep your eyeball steady, all laser machines have a target light for you to stare at.
What happens after the LASIK operation?
On same day of the surgery, most patient will experience some transient after effects, like mild discomfort, tearing, misty of vision and sensitivity to light. These are all normal and will usually cease after 12 to 24 hours. In patients with large pupils, other unwanted effect like starbursts and halos around lights can remain for months or even longer.
Is LASIK a safe procedure?
Overall speaking, LASIK is an extremely safe procedure. Serious complications are rare. Over- or undercorrections are the commonest, up to a few percent of all cases; but can be solved by a second operation (called enhancement surgery). Flap problems like wrinkling can usually be smoothed out by the doctor. Inflammation, if occurs, is usually easily controlled by early use of eye drops. Infection, with a chance of around one in several thousand procedures, is more dangerous and must be caught and treated as early as possible.
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什麼是 LASIK？
LASIK，有角膜切割激光矯正屈光手術(簡稱激光矯視)，是唯一可徹底矯正近視的方法。
近視患者一般眼球過長。進入眼球的光線因而聚焦在視網膜前面(視網膜為一層感光細胞)。情況正如一個對焦失準的影相機一樣。近視眼作用，就是把光線和影像重新聚焦於視網膜上。
LASIK 的原理，是以激光打磨眼角膜，將角膜弧度改變以改善視力。情況有如把角膜塑造成新的鏡片。LASIK比過往幾代的矯視手術精準、簡單、安全、而且復原時間更短。
我適直接受激光矯視嗎？
您要接受驗光師與眼科醫生的檢查，以決定閣下是否適合激光矯視。眼科醫生會詳細解 LASIK 的好處及風險。
LASIK 手術進行期間情況是怎樣的？
手術一般少於 30 分鐘 (包括準備工作)，實際的手術時間只要 15 分鐘左右。 LASIK 手術分為兩步驟。
LASIK 手術有痛楚嗎？我應如何合作？
手術期間您是清醒的。您可感到醫生輕觸您的眼睛，但不會有痛楚。因醫生會給您滴麻醉及消炎眼藥水，以確保手術無痛及清潔。醫生會用眼撐把眼睛撐開。眼撐會防止您閉上眼，所以就算眨眼亦無礙手術。電控制的追縱儀會偵測眼的些微移動。病人只需凝視一個目標燈，以確保眼球盡量隱定。 at.
LASIK 手術後又如何？
手術當日，多數病人會有短暫不適，例如輕微痛楚、流淚、模糊和畏光。這些都是正常現像，約 12 至 24 小時後就會消失。瞳孔較大的病人，眩光的現像會維持數月甚至較長的時間。
LASIK 手術安全嘛？
總括來說，LASIK 為一非常安全的手術。嚴重的併發痛十分罕見。較常見的情況是矯正不足或過度矯正，這大約是少於百分之十的情況，而且可以用修正手術矯正。角膜瓣縐摺等問題亦可由醫生解決。發炎等況可用眼藥水處理。感染的機會為數千分之一。這可以是嚴重的問題，必須及早診治。