近視雷射手術iLASIK

視力矯正已經走入全面電腦化及雷射化的時代，其中最新的iLASIK全雷射矯正為最新的矯正方式。製作角膜瓣是近視矯正的首要步驟，iLASIK手術 以無刀飛秒雷射，採用電腦預設程式，取代原本機械式製作角膜瓣的技術，大幅降低誤差的產生，能製作出更平整、更適合病患瓣膜厚度的角膜瓣。

雙和醫院眼科主任賴史忠表示，無刀雷射在進行角膜瓣切割時，可以切得更薄，與傳統手術相比，在同樣角膜厚度的前提下，可增加300~400度的矯正度數，且保留較多的後角膜，不但術後視力更穩定，也可減少術後併發症的發生機率，例如可能導致視力下降的圓錐角膜。

傳統手術較容易在角膜表面產生不平滑的痕跡，但無刀雷射則可達到角膜表面完全平滑的境界，降低眩光的發生率，再加上前導波的運用，減少手術中高階像差的產生，讓患者得以獲得比戴眼鏡更佳的視力品質。

賴史忠指出，iLASIK不論在安全性與術後視力品質上，都較傳統LASIK高，術後恢復期更短，適合高度近視、對視力品質要求較高的族群。醫師提醒，各 式近視手術琳瑯滿目，甚至打起價格戰，讓民眾無所適從。醫師強調，價格固然是考量的因素，但民眾選擇手術方式時，更應注意手術方式，及醫師的可靠性，畢竟 精緻的眼睛，容不了任何閃失。

Microkeratome & The IntraLaser Laser

LASIK is a two step process. First a thin flap of the eye’s corneal tissue is created and folded back, then a laser reshapes the interior of the eye and the flap is replaced. In regular LASIK surgery the flap is created with a hand held device housing a blade, called a microkeratome. While this has produced good results, most complications in LASIK are attributed to the blade.

		Traditional Microkeratome - Step One: The microkeratome is a razor like device opeated by hand or a motor. The blade slices off a portion of the cornea, leaving an uncut section to serve as the flap's hinge.
		Traditional Microkeratome - Step Two: The sliced section is then folded back to expose the underlying corneal layer. Although microkeratomes generally provide good results, they are a recognized source of minor and even sever complications.

IntraLASIK is a revolutionary bladeless technology that does not use a blade to create the corneal flap. Instead the IntraLase (femtosecond) laser's energy passes through the outer layer of the cornea until it reaches its exact focal point in the central layer. The laser then works in an 'inside out' process, precisely defining a flap and the amount of tissue below that plane. The resulting corneal flap is folded back and vision correction treatment is accomplished as usual. Then, the corneal flap is folded back onto the eye to complete the surgery.

		IntraLASIK - Step One: IntraLASIK software directs the INTRALASE FS Laser to optically focus its beam into a tiny, 3 micron spot of energy that passes harmlessly through the outer layers of the cornea until reaching its exact focal point within the stroma (central layer of the cornea).
		IntraLASIK - Step Two: In an "inside out" process, the laser beam creates a dissection plane by forming an interconnecting series of bubbles (made of carbon dioxide and water vapor).
		IntraLASIK - Step Three: The laser beam stacks a pattern of bubbles along the periphery of the ablation plane, leaving an uncut section of tissue to act as a hinge. As with a traditional LASIK approach, the surgeon then folds the tissue back to expose the underlying corneal layer to prepare for the excimer laser treatment that will re-shape the cornea.

 參考資料

1.http://mag.udn.com/mag/life/storypage.jsp?f_ART_ID=364941
2. http://bevhillslasik.com/procedures.html