Orthokeratology in Myopia Control

WHAT IS ORTHOKERATOLOGY

  • is a non-surgical procedure, thus free from any risks or side effects related to surgery.
  • Using high oxygen transmitted lenses to alter the shape of the cornea in order to decrease myopia; images can then be formed back on the retina. It can also be used to slow down the progression of myopia
  • Lenses are to be worn overnight, during sleeping hours and be removed on awakening. Orthokeratology lens wearer can have dear vision and be free of any spectacle aids during most waking hours. It’s safer and more convenient for those playing sports.
  • Changes in corneal curvature are only temporal. The cornea will always return to its original shape if lens wear is stopped.
  • According to previous researches done by The Centre for Myopia Research of the Hong Kong Polytechnic University, the progression of myopia is decreased by 50% on those children wearing orthokeratology lens, compared to those wearing normal glasses

 

Who is suitable for orthokeratology?

  • Myopia under-4.50DS; astigmatism under -1.50DC or those who want to control the progression of myopia.

 

SPECIAL CAUTION

  • Proper lens insertion, removal and cleaning regimen are essential to minimize the risk of infection.
  • Kids wearing orthokeratology lenses should be monitored/ supervised by parents for hygienic purpose.
  • Lenses should be thoroughly cleaned and disinfected everyday. Protein removal has to be done on a regular basis.
  • The outcome of orthokeratology varies from individuals. A low power prescription glasses might be needed during the day.

 

Interested in orthokeratology lenses?

  • Those who are interested should undergo a comprehensive eye care examination and an orthokeratology assessment Regular aftercares will be performed by optometrists during lens wearing period; lenses will be changed according to corneal changes to ensure a healthy cornea.
  • All optometrists in PolyVision, registered Part I optometrists, are able to use diagnostic drugs to perform a comprehensive eye examination before any orthokeratology begins. All centres are well equipped and available for all the assessment, trial lens fitting, lens ordering (2-4 weeks), lens wearing and follow up service.

 

FREQUENT ASKED QUESTIONS

Q1 Can myopia be decreased to zero by wearing orthokeratology lenses?

  • Orthokeratology lenses can only slow down the progression of myopia; existing myopia prescription cannot be treated or cured

 

Q2 Is orthokeratology lenses safe to wear?

  • There are potential risks for any contact lens wear. If patients can follow the given instructions in lens wearing schedule and lens cleaning, orthokeratology lenses will cause no harm. In case of any discomfort during lens wear or after lens removal, please stop lens wear and contact the optometrist. Those having eye diseases, dry eye syndrome, eyes allergy or non-regular sleeping hours are not suitable.

 

Q3 Can orthokeratology lenses improve our eyesight?

  • Outcome varies from individuals. Whether one can have good vision after lens removal depends on individual, factors include:

– Degrees of myopia and astigmatism

– Corneal curvatures and corneal stiffness

– Lens centration (any eyes rubbing causing lens dislocation during sleep)

– Wearing time (sleeping hours)

– Tears adequacy

  • Non-ideal corneal curvature change or residue myopia will end up with mildly blurry vision during the day or later in the afternoon, glasses might be needed to help accordingly.

 

Q4 Will eyes rubbing during sleeping hours affect the outcome or the health of the eyes?

  • If orthokeratology lens is dislocated from eyes rubbing, vision might be affected in the morning and the cornea might be scratched. Minor corneal injury will be recovered few hours after lens removal. Serious corneal injury must cease lens wear and/or refer to the Ophthalmologist.

 

Q5 Is frequent lens change necessary during the lens wearing period?

  • Lens change depends on the power of myopia and astigmatism, corneal reaction and outcome. Same lens might be used if there is no residue myopia and fitting is optimal. Optometrist might need to have minor adjustments with the orthokeratology lens if there is any residue myopia in waking hours. Since the high oxygen transmitted orthokeratology lenses can easily be scratched or have an accumulation of deposits, yearly lens replacement is suggested to maximize hygiene and corneal health.

 

Q6 Do I still need to do follow up or wear lenses after few years of orthokeratology?

  • If orthokeratology lens is a replacement for spectacles or contact lenses, you have to keep wearing the lenses in order to stabilize the daytime vision. If orthokeratology lens is used to control the progression of myopia, procedure can be ceased after puberty. Patients can then choose to wear spectacles or contact lenses, or continue with orthokeratology lenses. Since hygiene, lens quality and wearing time are crucial in orthokeratology, patients should follow all the instructions given by the optometrist, regular checkups every 3-6 months, never skip any follow up appointments.
2022_Orthokeratology in Myopia Control

我現在雙眼的近視度數為800度,而隱形眼鏡只有500多度,那副隠形眼鏡還可以佩戴嗎?

根據閣下描述的近視度數應該是鏡片度數800度,而鏡片度數與隱形眼鏡度數是不相通的,不可作直接比較,不能單憑度數比較來判斷適合與否。因此,建議閣下接受全面眼科視光檢查及隱型眼鏡跟進護理,由眼科視光師為閣下檢查後作判斷及建議。

全面眼科檢查可驗到飛蚊症不?

若懷疑有飛蚊症可作詳細的眼睛檢查,當中包括放曈檢查,可排除視網膜有其他問題,再由眼科視光師作合適的建議或處理。

我女兒今年十二歲 但眼睛經常會眨眼 而且眨眼頻道非常頻密 以配戴眼鏡 會有什麼原因導致不停眨眼 謝謝回答

孩子頻繁眨眼的原因有很多,可能是因為他們感到眼睛乾澀,因此會常眨眼來分泌更多的淚水。亦有可能是眼睛感到有異物感,例如有塵埃碎屑等異物或睫毛入眼所引起的,這有機會會刮傷角膜表面。另外,亦會因近視或遠視令他們視力模糊,以為頻繁眨眼能夠看清一點。建議帶孩子作詳細眼睛檢查,以查明真正原因。

想問一下如果我眼睛弧度只有7.3MM 有COLOUR CON配到嗎? 價錢大約多少? 我之前不清楚我弧度 帶了8.6MM COLOUR CON 很多年 令眼睛不時會痛 怕光 眼睛痛到上頭痛。我應該做什麼檢查?費用多少?THANKS

不能單憑眼睛弧度作判斷,驗配合適的隱形眼鏡必須由眼科視光師檢查後作驗配,實際試戴上眼,確保度數,角膜弧度等合適,不會損害眼睛健康。如佩帶不合適的隱形眼鏡或佩帶不當是有機會刮傷角膜令眼睛感到痛楚及怕光等。建議閣下找眼科視光師作全面眼科視光檢查及隱形眼鏡驗配,由眼科視光師根據實際眼睛情況為閣下驗配合適的隱形眼鏡。

女兒今年2年級,一年級時才發現有百多度近視,二年級下學期近視突升至400度,已睇眼科專科及用最輕濃度0.01的眼藥水,眼科醫生翻睇所有病歷,最後覺得眼球結構中的視網膜天生較薄,所以較易近視加深。只好改用0.1濃度的阿托品眼藥水控制近視。想請教天生視網膜教薄(照結構時呈現藍色)會有什麼問題?是否近視不斷加深的原因?會不停深下去,哪會否失明?

天生視網膜較薄不會導致近視不斷加深,可是反之深近視會令眼球繼續生長拉長,視網膜會被拉薄,是比較高風險出現視網膜脫落的情況,如沒有及時處理視網膜脫落的情況是有機會導致失明的。閣下應從孩子日常生活習慣著手去留意近視不斷加深的原因,如長時間近距離閱讀/玩手機電玩,這都是其中的一些關鍵原因。如有懷疑,請向閣下的眼科醫生查詢。

晚上戴在ok鏡早上可以戴大眼仔嗎?

因戴OK鏡後,角膜弧度有可能有變化,便會與大眼仔的隱形鏡片弧度不配合而導致不適,嚴重時有機會令角膜損傷,建議向閣下的眼科視光師諮詢。