Orthokeratology 角膜矯形術
(近視控制, 角膜矯視 隱形眼鏡, 角膜矯形鏡, OK-lens, Myopia Control, Vision treatment, Ortho-K, Corneal Refractive Treatment)
   
羅暢星博士 Dr. Samuel Law Cheung-Sing
朱灝偉博士 Dr. Patrick Chu Ho-Wai*
吳耀輝博士 Dr. Forrest Ng Yiu-Fai*
*美國眼科視光學院院士 Fellowship of the American Academy of Optometry
查詢，請至電 21530008
For more information please contact Tel: 21530008
   
何謂角膜矯視矯形 (角膜矯視) 療程?
角膜矯形矯視是在不用開刀的情況下，可將近視度數減低或回復正常視力的療程。角膜矯形矯視療程是一種由眼科視光師專為個人設計的近視矯正療程。原理是透過配戴一系列的高透氣硬隱形眼鏡(角膜矯視鏡)將角膜的外形在晚間逐漸變平，使近視和散光暫時減低，使配戴者日間不用戴眼鏡。有研究指角膜矯視矯正療程
可停止或減慢近視加深[1].
What’s Ortho-K / CRT (Orthokeratology)?
Orthokeratology treatment is a non-surgical myopia (short-sight) treatment. By use of a series of high oxygen transmissibility rigid contact lens, the cornea will be flatten at night under supervision of Optometrist. Orthokeratology is effective in reducing myopia and astigmatism in day time. In addition, scientific research demonstrated that
Orthokeratology may stop or retard the myopia progression [1].
  
透過先進且精確的眼角膜地形圖(眼球表面形狀掃描器)，矯視矯形療程的進展和功效能即時和準確地展示給家長知道，且能提供視光師重要資訊，確保過程安全有效。
The Orthokeratology is guided and monitored by state of the art corneal topographer. The corneal shape modification and accuracy can be reviewed immediately.
適合甚麼人士？
- 7歲或以上
- 近視600度以下
- 散光150度以下 (如散光超過150度,則需要使用散光角膜矯視鏡片)
- 近視加深速度快
- 經常做運動的人士(水上活動: 游泳, 潛水, 滑水)
- 不適宜做LASIK激光矯視的人士
優點
1. 早上摘下鏡片後一般能全日保持良好視力。
2. 研究顯示角膜矯形術能有效減慢兒童近視加深[1]。
3. 角膜矯形術一般能於兩星期內減低高至500度近視，不過個人差異可影響成效。
4. 可避免一些常見於傳統隱形眼鏡引起的問題，例如眼乾、沙塵入眼等。
5. 是LASIK激光矯視以外的選擇, 不用開力, 不引起眼乾 。
6. 可隨時停止治療，在一般情況下，眼睛可於數星期內回復原狀。
缺點
1. 不能將近視根治，一旦停止戴鏡，效果便會於數天內消失。
2. 可出現一些與佩戴隱形眼鏡有關的問題，例如：藥水過敏、感染、角膜表皮受損或角膜潰瘍等，出現問題的機會受佩戴者的依循性影響
3. 佩戴者必需定時覆診。
注意! 緊記!併發症是隨時可以發生的，與眼科視光師有良好的溝通，跟從指示使用角膜矯視鏡片以及定期覆診，能大大減低發生問題的機會。若你的子女不能自行清洗隱形眼鏡，便請父母代勞，否則，不宜讓你的子女進行角膜矯形術的治療 。
Who are suitable for this therapy?
- at least 7 years old
- Less than -6.00D of myopia and with less than -1.50D of astigmatism. (For those with corneal astigmatism higher than -1.50D, toric / astigmatism orthokeratology lens may be needed)
- Myopia are progressing rapidly.
- Sports and water sports enthusiastic, e.g. swimming, diving, skiing.
- For those not suitable for LASIK refractive surgery
Pros:
1. Good vision can usually be maintained throughout the day after lens removal.
2. Recent research has shown the treatment to be effective in slowing myopic progression in children [1] .
3. Ortho-k can reduce myopia of 5.00D within two weeks. However, individual variation does exist.
5. Complications associated with conventional contact lens wear, such as dryness and irritation from dust can be avoided.
6. Safe alternative to LASIK laser refractive surgery with no wounds and no dry eyes.
7. The treatment is reversible and can be stopped anytime. The eyes will soon resume their normal condition thereafter.
Cons:
1. Ortho-k is NOT a CURE for myopia. The treatment effect will wear off gradually after stopping lens wear.
2. Aftercare consultations are necessary to ensure effective and safe treatment.
3. Some contact lens-related problems, such as solution sensitivity, infection, corneal epithelial trauma or ulceration may occur, though the risk of complication is very dependent on compliance.
4. It is important to attend regular aftercare consultation.
Attention! Remember complications can happen anytime! Minimise the chance of these complications through good communication with your optometrist, strict compliance and regular aftercare consultations. Parents of children who are unable to handle their contact lenses hygienically should be prepared to do these for their children, or if not, SHOULD NOT allow their children to undergo Ortho-k treatment.
1. Cho P, Cheung SW, Edwards M. The longitudinal orthokeratology research in children (LORIC) in Hong Kong: a pilot study on refractive changes and myopic control. Curr Eye Res 2005;30(1):71-80.
Case Demo for child myopia correction 兒童近視矯正之示範:
All results will be presented by computerized corneal scanner. All effects can be depicted clearly to the wear and parent.
所有結果均以眼角膜地形圖(眼球表面形狀掃描器)記錄,配戴者和家人可更易明白掌握角膜矯形術和近視控制的效果
相關連結 References:
近視控制方法概覽 Night Sight Control Methods Review
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查詢，請致電 21530008
For more information please contact Tel: 21530008
Eyesight Hong Kong Optometry Center
香港視覺護眼中心
Orthokeratology Hong Kong, OK lens, orthok, 近視控制, Ortho-K, Corneal Refractive Treatment, 角膜矯視, 角膜矯形鏡, OK-lens |
