Frequently asked questions about Ortho-K
We've gathered the questions families and patients in Barcelona ask us most often. If yours isn't here, write to us and we'll add it.
Frequently asked questions
What is Ortho-K?+
Ortho-K, or orthokeratology, is a technique that uses special contact lenses overnight to temporarily reshape the cornea and improve daytime vision.
How do overnight lenses work?+
They are inserted before sleep and gently reshape the corneal surface during the night. On removing them in the morning, many people can see more clearly during the day.
Does Ortho-K hurt?+
It does not usually cause pain. Some sensation may be noticed at first that normally disappears after a few nights of adaptation.
How long until it works?+
Some people notice changes from the first nights; stabilisation is usually reached over the first weeks.
Is the effect permanent?+
No. The effect is reversible and depends on continued use of the lenses.
Is it suitable for children?+
It can be an interesting option in selected children and teenagers, always after professional assessment and with regular follow-up.
Can it help with myopia control?+
Ortho-K can be part of myopia control strategies. Suitability must be assessed case by case.
Is it an alternative to surgery?+
It is a non-surgical and reversible option. It does not replace a medical indication nor is it suitable for everyone.
Can I play sports during the day without glasses?+
Many Ortho-K users can play sports without glasses or daytime lenses, depending on individual results.
Who cannot use Ortho-K?+
It is not suitable in cases of poor hygiene, eye infections, certain corneal alterations or prescriptions outside the usual range, among others.
What's the difference between Ortho-K and normal contact lenses?+
Conventional lenses are worn during the day. Ortho-K lenses are worn overnight and aim to improve daytime vision.
How often are check-ups needed?+
Follow-up is regular. The exact schedule will be set by the professional based on each case.
Where can I have an Ortho-K assessment in Barcelona?+
You can book an assessment at Looptica or Òptica CODE, both in Barcelona.
Is there Ortho-K assessment for children in Barcelona?+
Yes. Both Looptica and Òptica CODE can assess paediatric cases and guide families.
Which clinic suits me best: Looptica or Òptica CODE?+
You can choose whichever clinic is more convenient. Both can carry out the assessment.
How long does an Ortho-K assessment take?+
It usually takes more time than a conventional check-up, as it includes specific tests such as corneal topography.
Do I need corneal topography for Ortho-K?+
Yes. Topography is a key test to assess suitability and design the lens.
Can I ask for a second opinion on childhood myopia?+
Of course. A second assessment can bring peace of mind to families before making a decision.
Does Ortho-K help with exams for Mossos, Bombers or Guardia Urbana?
It can be a valid option in many calls because it lets you sit the exam without glasses or contacts and without surgery. We have a dedicated page with indicative figures, timelines and specific FAQ.
See the public-exams page →
Content reviewed by Elena Sentís, optometrist (registration no. 18568) and owner of Looptica Poblenou. Specialist in advanced contact-lens fitting, Ortho-K and myopia control.
Last reviewed: July 2026About Elena Sentís →