What are orthokeratology lenses? What do they do?

• Orthokeratology lenses, also known as OK lenses, resemble regular contact lenses in appearance but are made of a harder material with higher breathability, making them suitable for overnight wear.
• When worn at night, the lenses apply mechanical pressure^[1] to flatten the central cornea, reshaping it back to its normal state.
• After removing the lenses in the morning, the reshaped cornea does not immediately revert but maintains its new shape for some time. This allows temporary vision correction without glasses and slows the progression of myopia^[2].

Who is suitable for orthokeratology lenses?

• Myopic patients (both teenagers and adults) seeking to control their prescription. However, those with pseudomyopia do not need them.
• Due to the higher skill required for handling, they are recommended for children aged 8 and above.
• Suitable for myopia under 600 degrees with astigmatism not exceeding 150 degrees.

When should orthokeratology lenses not be worn?

• Children under 8 or those unable to wear them properly without parental assistance.
• People with eye conditions like dry eye, glaucoma, or high intraocular pressure.
• Those with corneal inflammation, injury, or prior corneal surgery.
• Individuals who are pregnant, breastfeeding, or trying to conceive.
• Temporarily discontinue use during illness (e.g., cold, fever).

How to insert and remove orthokeratology lenses?

Preparation:

• Trim long nails to avoid scratching the lenses.
• Wash hands thoroughly with soap and running water, then dry them.
• Use a mirror for guidance and place a towel beneath to catch dropped lenses.

Insertion:

• Check for deposits, scratches, or damage on the lens—do not wear if present.
• Clean the lens with a specialized solution, even if no deposits are visible. Rub gently, rinse, and avoid using other liquids.
• Add 1–2 drops of lubricating solution to the concave side of the lens.
• Hold eyelids open, look straight ahead, and avoid moving the eyeball.
• Gently place the lens on the center of the cornea. Hold briefly before releasing eyelids—lower lid first, then upper.

Removal:

Apply lubricating drops to loosen the lens before removal. Once the lens moves freely, use one of these methods:

• Manual Method: Use fingers to lift the lower eyelid, press gently on the upper edge of the lens, and it will detach.
• Suction Tool: Use a suction tool to grip the lens edge, slide it horizontally to allow air underneath, then remove.

Children may require parental assistance for insertion and removal.

How to care for orthokeratology lenses daily?

Lens Care:

• Clean lenses before and after each use.
• Store lenses in fresh disinfecting solution daily.
• Use enzymatic cleaner weekly to remove protein deposits.

Case Care:

• Empty and rinse the case daily. Scrub it with a brush weekly, then sterilize with boiling water and air-dry.
• Replace the case every 3 months.

What are the risks of improper orthokeratology lens use?

Poor hygiene during wear or care may cause corneal infections (e.g., keratitis, conjunctivitis). Untreated infections can lead to permanent vision damage.

What are the benefits of orthokeratology lenses?

• Reversible effects and lower risk compared to surgery.
• Reduces dependence on glasses during the day (effectiveness varies by individual).
• Slows myopia progression by reshaping the cornea, unlike regular glasses or contacts.

What are the drawbacks of orthokeratology lenses?

• Higher cost than regular contacts/glasses, requiring replacement every 1–2 years.
• Demanding daily care and insertion/removal routines. Poor hygiene risks infections.
• Not universally suitable—requires thorough evaluation before fitting.