What Are the Side Effects of Ortho-K Lenses?

What Are the Side Effects of Ortho-K Lenses?

Orthokeratology (Ortho-K) is a popular, non-surgical option for correcting vision and slowing myopia progression in children and adults. By wearing specially designed contact lenses overnight, Ortho-K gently reshapes the cornea so you can see clearly during the day without glasses or daytime contacts.

As with any medical treatment, patients often ask:
“Are there side effects to Ortho-K lenses?”

The short answer is yes — most side effects are mild, temporary, and manageable, especially when lenses are properly fitted and monitored by an optometrist. Below, we break down the most common side effects, what’s normal, and when to seek care.

Common and Temporary Side Effects of Ortho-K

1. Mild Discomfort or Awareness
When first starting Ortho-K, it’s normal to feel some lens awareness at night, especially during the first few days.

• Often described as pressure rather than pain

• Typically improves within the first week

• Most patients adapt quickly as the eyes adjust

At DeSouza Optometry, we closely monitor this adjustment period to ensure comfort and proper lens fit.

2. Temporary Blurry Vision or Halos
Some patients notice:

• Slight blur in the early morning

• Halos or glare around lights, especially at night

This usually occurs during the initial adaptation phase while the cornea is responding to treatment. Vision typically stabilizes as wear becomes consistent and lens parameters are fine-tuned. 

3. Dryness or Mild Eye Irritation
Because Ortho-K lenses are worn overnight, some patients may experience:

• Dryness upon waking

• Mild irritation or redness

• Proper lens cleaning and care

• Lubricating eye drops (if recommended)

• Adjustments to lens material or fit

Patients with pre-existing dry eye can often still wear Ortho-K successfully with the right customized management plan. 

Less Common but Important Side Effects

4. Lens Decentration or Inconsistent Vision

If a lens shifts during sleep, it can cause:

• Uneven vision during the day

• Ghosting or shadowing of images

• Prolonged use of eyes with lenses in before going to sleep. 

This is not dangerous but indicates that the lens design/ fit may need adjustment or a shift in lifestyle before bed. Regular follow-ups are essential to identify the issue in order to keep vision clear and stable.
 

5. Increased Risk of Eye Infection (Rare)
Like all contact lenses, Ortho-K lenses carry a small risk of eye infection if hygiene instructions are not followed.
Risk factors include:

• Poor lens cleaning habits

• Sleeping in damaged lenses

• Skipping follow-up visits

When worn under professional supervision with proper care, Ortho-K is considered safe for both children and adults. Education and compliance play a major role in minimizing risk.

Are Ortho-K Side Effects Permanent?

No. One of the key advantages of Ortho-K is that it is fully reversible.

• If lens wear is stopped, the cornea gradually returns to its original shape

• Any vision changes caused by Ortho-K are not permanent

• Side effects typically resolve once wear is discontinued or adjusted

Who Is Most Likely to Experience Side Effects?

Side effects are more likely when:

• Lenses are not custom-fitted

• Follow-up visits are missed

• Cleaning instructions are not followed

• There is ongoing dry eye or lid disease

This is why Ortho-K should always be fitted and monitored by an experienced optometrist.

How DeSouza Optometry Minimizes Side Effects

At DeSouza Optometry, patient safety and comfort come first. Our Ortho-K process includes:

• Advanced corneal mapping before fitting

• Careful lens selection and customization

• In-depth initial consultation to identify lifestyle and interests to customize fit and experience

• In-office training for lens care and hygiene

• Regular follow-up appointments to monitor eye health

• Ongoing adjustments to ensure optimal comfort and vision

This personalized approach significantly reduces the risk of complications.

Is Ortho-K Right for You or Your Child?

Most patients tolerate Ortho-K extremely well and enjoy the benefits of:

• Clear vision without daytime glasses

• Effective myopia control

• A non-surgical, reversible solution

If you’re considering Ortho-K and have concerns about side effects, we’re here to help.

Book a consultation at DeSouza Optometry to find out whether Ortho-K is a safe and suitable option for you or your child.