SMILE Pro & LASIK

激光矯視技術面世數十年，讓不少深近視或散光的人士擺脫佩戴厚重眼鏡的不便。角膜切割激光矯視手術(LASIK) 和小切口透鏡切除術（SMILE，又稱「微笑矯視」）是目前最普遍的激光矯視技術。隨技術的發展，SMILE已發展至第三代的SMILE Pro，為病人帶來更精準及有效率的手術選擇方案。

LASIK 打磨角膜中層組織

LASIK的原理是利用飛秒激光切割角膜薄片，然後打開角膜瓣，再用準分子激光打磨角膜的中層組織，以改變角膜弧度，最後把角膜瓣蓋上，適用於矯正近視50度至1400度、散光或遠視至600度。

而SMILE，則毋須揭開角膜瓣，手術採用飛秒激光從角膜中層切出透鏡狀的角膜組織，通過只有約兩至四毫米的微細切口，把角膜組織分離並取出，令角膜弧度改變而達致矯視效果。

SMILE Pro 提升激光射頻速度

SMILE至今已發展至第三代SMILE Pro，其激光射頻速度由第二代的500KHz（千赫）提升至2MHz（毫赫），手術時間由平均25秒，大大縮短至單眼激光時間只需10秒；另亦具備中視軸、散光軸的導航定位，可用於術前精準定位，提升手術精準度及矯視後的視覺質素。這些改良可讓有手術焦慮或眼球較敏感的人士，免卻接受矯視手術時需要定點注視及保持靜止半分鐘的顧慮。

減輕病人手術焦慮感

以往病人在手術時如眼球不自覺地移動或用力眨眼，或會導致「失吸」，影響矯視效果甚至損失視力。臨床所見，大部分因眼球偏位而導致「失吸」的情況均發生於激光切割的尾聲。如手術中途發生「失吸」或需中止手術，患者約需在三個月後重做手術，或可考慮在即日或數天後進行LASIK。而Smile Pro手術縮短激光時間有助減低手術時眼球偏位和「失吸」的風險，提高矯視的成功率。手術秒速完成也大大減輕病人的焦慮感，改善他們的整體體驗。

撰文：養和醫院眼科中心視力矯正主任張叔銘醫生

文章刊於2024年8月28日《明報》「養和醫道百科」專欄

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Ophthalmology Refractive Surgery Eye Surgery

About Dr. CHANG So Min, John

張叔銘醫生

Dr. CHANG So Min, John

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Hong Kong Sanatorium & Hospital

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Honorary Clinical Associate Professor, Department of Ophthalmology (HKU)

Clinical Associate Professor (Honorary), Department of Ophthalmology and Visual Sciences (CUHK)

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