What orthokeratology is.
It is a non-surgical technique based on overnight contact lenses designed for each eye. The optical effect is temporary and reversible: it depends on continued wear and gradually fades when the lenses are stopped.
Orthokeratology in Barcelona: how Ortho-K works
Orthokeratology is an advanced contact lens technique using rigid gas-permeable lenses overnight to temporarily reshape the cornea. This guide explains possible indications, limitations and the assessment process.
Orthokeratology in detail
How overnight lenses work.
During sleep, the lens geometry produces a controlled change in the superficial corneal layers. After removal in the morning, some people may see more clearly during the day without glasses or daytime contact lenses.
Who may be assessed.
It can be considered for selected children and teenagers as part of a myopia-control strategy, for athletes and for adults who want less dependence on glasses during the day. Suitability depends on prescription, cornea, eye health and individual habits.
What the assessment involves.
Assessment includes prescription and eye-health checks, corneal topography and any additional tests the professional considers appropriate. Corneal shape and tear film help determine whether a design is viable.
Safety, hygiene and follow-up.
Hand washing, cleaning with recommended products, no tap water and attending reviews are essential parts of the process. If there is pain, a red eye or abnormal vision, remove the lens and seek advice.
When it may not be suitable.
Active eye infections, certain corneal conditions, severe dry eye, difficulty maintaining hygiene or inability to attend follow-up may make it unsuitable.
The decision is individual.
Orthokeratology is not an off-the-shelf product that can be bought without an assessment. Each fitting should be explained with its alternatives, expectations and limitations before starting.
Frequently asked questions
Is orthokeratology the same as Ortho-K?
Yes. Ortho-K is the short name for orthokeratology, a technique using rigid contact lenses overnight to create a temporary optical effect on the cornea.
Can you sleep in orthokeratology lenses?
Yes, they are designed for overnight wear after professional fitting and with the required hygiene and follow-up instructions.
Is the effect permanent?
No. The effect is reversible and depends on continued lens wear. If lenses are stopped, the cornea gradually returns towards its usual shape.
Can it help with myopia control?
It can be part of a myopia-control strategy for selected children and teenagers. Suitability and follow-up must be assessed individually.
Keep reading
What is it
What orthokeratology (Ortho-K) is, how overnight lenses work, their effect on the cornea, and how they differ from daytime lenses or surgery.
→Myopia control
Myopia control in children and teens in Barcelona with Ortho-K: strategies, how overnight lenses work and professional follow-up.
→Ortho-K cost
Indicative Ortho-K cost in Barcelona: €200 assessment, €290-360 per lens, with follow-up reviews and adjustments included.
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Content reviewed by Elena Sentís, optometrist (registration no. 18568) and technical director of Looptica Poblenou. Specialist in advanced contact-lens fitting, Ortho-K and myopia control.
Last reviewed: July 2026About Elena Sentís →