Orthokeratology is an increasingly popular option for both adults and children who want to manage myopia or enjoy lens-free vision during the day.
As with any contact lens treatment, it’s important to understand the potential side effects so you can make an informed decision and care for your eyes properly.
In this article, we’ll explain common side effects, how to manage them, and what you can do to reduce the risk of complications.
What Are Ortho-K Lenses?
Orthokeratology, commonly called Ortho-K, uses customised rigid gas-permeable contact lenses to gently reshape the cornea while you sleep. The lenses are removed in the morning, and the temporary change in corneal shape can provide clear vision during the day.
Unlike regular daytime contact lenses, Ortho-K lenses are designed specifically for overnight wear. The treatment is reversible, meaning the cornea gradually returns towards its original shape if the lenses are no longer worn.
What Are the Common Ortho-K Side Effects?
Most side effects of Ortho-K lenses are mild and temporary, particularly during the initial adjustment period. However, correct lens fitting, good hygiene, appropriate overnight wear and regular follow-up are important for reducing the risk of complications.
Common Ortho-K side effects can include:
1. Mild Discomfort or Lens Awareness
It is normal to notice the lenses when you first start wearing them. Some people experience mild discomfort or awareness during the first few nights while their eyes adjust.
Do Ortho-K lenses hurt? They should not cause significant or persistent pain. If the lenses are painful, feel excessively uncomfortable or continue to irritate your eyes, remove them as instructed and contact your optometrist.
Your optometrist can check whether the lens fit, positioning or eye surface needs further assessment.
2. Blurred or Fluctuating Vision
Vision can fluctuate during the early stages of Ortho-K treatment. Some people may experience blurred vision, particularly while the cornea is adapting to the treatment.
Vision generally becomes more stable as treatment progresses. If blurred vision persists, becomes worse or occurs suddenly, an optometrist should assess the eyes and lens fit.
3. Halos or Glare at Night
Some Ortho-K wearers notice halos, glare or rings around lights, particularly at night. This can be more noticeable during the early stages of treatment.
These visual effects may be influenced by factors such as pupil size, prescription, treatment zone and corneal shape. Your optometrist can assess whether the lenses are appropriately fitted if these symptoms persist.
4. Lens Binding
Lens binding occurs when an Ortho-K lens does not move normally and may feel stuck to the eye after sleeping. Dryness or insufficient tear exchange can contribute to this problem.
Do not force a lens off the eye. Follow the removal instructions provided by your optometrist and use only the recommended lubricating or saline products if advised.
If you regularly have difficulty removing your lenses, contact your optometrist for an assessment.
5. Eye Dryness
Some people experience dryness, irritation or a gritty sensation while adapting to Ortho-K. Changes in the tear film and overnight lens wear can contribute to these symptoms.
Your optometrist may recommend appropriate lubricating drops or changes to your lens-care routine. Persistent dryness should be assessed rather than managed without professional advice.
6. Corneal Staining or Edema
Corneal staining refers to changes seen on the surface of the cornea during an eye examination. It can occur for several reasons, including lens fit, dryness or problems with lens wear and care.
Your optometrist can identify corneal staining during follow-up examinations and determine whether changes to the lens fit or treatment routine are needed.
7. White Lesions or Deposits
With long-term use, small white spots or deposits may appear. These are rare and often linked to hygiene or overwear. Regular check-ups ensure early detection and management.
8. White Spots or Corneal Deposits
White spots or deposits on the cornea or lens can have different causes and should not be ignored. They may be associated with inflammation, infection, deposits or other changes that require professional assessment.
If you notice a white spot on the eye or experience pain, redness or changes in vision, contact your optometrist promptly.
What Are the Risks of Ortho-K and CRT Lenses?
Ortho-K and other overnight rigid contact lens treatments, including CRT lenses, carry risks associated with contact lens wear.
The most serious potential complication is microbial keratitis, a corneal infection. Although uncommon, microbial keratitis can become serious and may affect vision if it is not treated promptly.
The risk can increase with poor lens hygiene, inappropriate lens wear, overwear or exposure to water while wearing lenses.
What Are the Warning Signs of an Eye Infection?
Contact your optometrist promptly if you experience:
- Significant or worsening eye pain
- Increasing redness
- Light sensitivity
- Sudden or worsening blurred vision
- Unusual discharge
- Marked swelling
- Difficulty opening the affected eye
Do not continue wearing Ortho-K lenses when your eye is painful, red or irritated unless your optometrist has specifically advised you to do so.
At Optometrist Parramatta, we use advanced corneal topography to customise Ortho K lenses for your eyes. We then follow up regularly to check the fit, monitor corneal health, and make adjustments as needed.
This is particularly important for children, whose eyes are still growing and changing.
When to See Your Optometrist
Ortho-K lenses should feel comfortable and provide clear vision throughout the day. You should book an appointment if you experience:
- Persistent discomfort
- Redness or irritation
- Sudden vision changes
- Light sensitivity
- Difficulty removing lenses
These symptoms may signal an issue that needs prompt attention.
In Summary
While generally safe when used properly, Ortho-K carries a slightly higher risk of serious eye infection compared to daily contact lenses due to overnight wear.
Always follow your optometrist’s instructions for proper hand hygiene, lens cleaning, disinfection, and storage.
Never wear the lenses if your eyes are red, painful, or irritated, and seek immediate professional care if you experience eye pain, redness, discharge, light sensitivity, or sudden vision changes.
If you’re interested in Ortho-K or have questions about side effects, we’re here to help.
Book a consultation at Optometrist Parramatta to find out whether Ortho-K is the right option for you.
This content is for general information only and is not a substitute for professional eye care advice, diagnosis, or treatment. Always consult a qualified optometrist or healthcare professional regarding your individual circumstances.
