PROFESSIONAL AREA   |       |   


Night lenses: how do they work?

The term “night lenses” refers to orthokeratology lenses.
Orthokeratology or “correction through corneal reshaping” is a principle that allows clear vision throughout the day without wearing contact lenses or glasses, thanks to lenses that are worn during the night.

A proven technology for over 20 years, orthokeratology has benefited in recent years from major innovations in both lens designs and materials. This technique is considered, among other things, as an effective solution to reduce myopia.

Safe and painless, adaptation to night lenses also has the advantage of being non-invasive and completely reversible: wearers can stop using them at any time and choose another correction mode.

DRL lenses are worn at night and correct your visual defect while you sleep.
When you wake up, you remove your lenses and find you have clear vision throughout the day without the need to wear contact lenses or glasses. These lenses correct myopia whether or not it is associated with astigmatism, hyperopia and the beginnings of presbyopia. They are particularly recommended to slow myopia progression in children.

DRL night lenses: myopia control and prevention from the age of 7

DRL night lenses: myopia control and prevention for children

Real innovation, DRL PREVENTION night lenses have been specifically developed to stabilize and stop progressive myopia for children.
Those lenses have a preventive action on low myopia progression and are strongly advised to treat progressive myopia lower or equal to -4.00D, from the age of 7.
The earlier the child is treated, the more the progression of his/ her myopia will be slowed down.

Night lenses: new-found freedom

In addition to controlling myopia in children, night lenses guarantee total visual freedom throughout the day.
Children, teenagers and adults no longer have any constraints related to wearing glasses or contact lenses during the day, and enjoy a quality of vision during their daily activities as if they had no visual defect.

Night lenses: who are they for?

lenses for myopia and astigmatism - Precilens night lenses

Night lenses are intended for myopic patients with or without astigmatism (myopia up to -7.00 D and astigmatism up to -4.00 D), hyperopic patients (up to +4.00 D) and patients with the beginnings of presbyopia.

For children and young people:
They are particularly recommended for:
• The correction and slowing of progressive myopia.
• Participation in sporting activities, including water sports.

The big advantage of night lenses for children is that they only handle their lenses at home, under parental control, which limits the risk of infection and problems of breakage or loss.
Moreover, young people who participate in sports such as horse riding or swimming are delighted to be free from the constraints of their contact lenses or glasses. Night lenses totally change their lives!
This treatment provides real safety for parents and a great deal of freedom for children and young people.

night lenses - myopia in children


For adults:
They are particularly recommended for:
• Sporting activities,
• Work in front of computer screens and in air conditioned environments,
• Occupations requiring a high level of visual acuity without corrective devices (people working in dusty environments, firefighters, etc.),
• Soft lens wearers complaining of discomfort or dry eyes,
• Individuals who no longer wish to wear glasses,
• Individuals who are not ready or who are not good candidates for refractive surgery.



Contraindications exist but are quite rare:

- A pathology of the surface of the eye (infections, herpes etc.)
- Severe allergies
- Oversized pupils
- Less than six hours of sleep
- Irregular sleep patterns

Getting ready for night lenses:

night lenses to correct myopia while sleeping

Night lenses are medical devices whose adaptation must compulsorily be prescribed by an ophthalmologist:

• You need to make an appointment with a specialist in night lenses.
• Your practitioner chooses tailor-made lenses for you that will shape the curvature of your cornea while you sleep.
• Reshaping occurs gradually throughout the night. It is recommended to sleep with your lenses in for at least 6 hours for the treatment to be effective.
• The visual results are not convincing from the first night: it is necessary to wait 8 to 15 nights of wearing to obtain an optimal result which stabilises after 3 weeks.
• Several follow-up appointments with your prescriber are necessary at the beginning of wearing night lenses.
• To maintain the same quality of vision every day, it is necessary to wear your lenses every night, because when you stop treatment, the cornea returns to its original shape after 24 to 48 hours and myopia returns.
• Regardless of the wearer’s age, night lenses require a regular sleep cycle and impeccable hygiene.
• For effective and safe treatment, it is essential to renew your night lenses every year.

Night lenses: how much do they cost?

For an initial prescription, it costs between €400 and €500 for a pair* of night lenses.

*You will have to add the practitioner’s fees for lens adaptation to this cost.

Night lenses: exclusive services

For first time wearers, the Precilens laboratory offers, subject to availability, the 1st STEP PACK, providing you with one month’s complete maintenance solution.

Ideal for starting out with night lenses, the 1st STEP PACK contains:

- 1 bottle of OXYClean solution needed for cleaning and disinfecting lenses
- 1 box of 30 doses of AQUADrop+ comfort drops recommended for insertion and removal of lenses
- 1 cupping glass to remove the lens in case where it is positioned on the sclera (white of the eye)

At the end of the trial period, these products are available in three-month PACKS including 2 bottles of OXYClean, 3 boxes of AQUADrop+ and 1 box of Procare (for deproteinization).
OXYClean, AQUADrop+ and Procare solutions can also be purchased individually and independently of the three-month PACK.



I have always been told not to wear my lenses at night. Is it really safe for my eyes?

Made to measure, DRL night lenses have been specifically designed to be worn at night and are made of a high permeability material which enables a good level of oxygenation for the eye.

Can this type of device be dangerous for the eyes?

No. These lenses are made to measure and perfectly respect the physiology of your cornea.
Of course it is imperative to strictly adhere to the hygiene rules (hand-washing before inserting and removing, and daily care) which are necessary for safe wearing, and renew your lenses every year.
Studies have proved that there is less infection risk from wearing night lenses than from wearing day lenses.

Are night lenses comfortable?

Yes. Their large diameter means that these lenses are very comfortable. The fact that they are worn at night also avoids the wearer blinking while they are inserted (which can be the source of discomfort sometimes felt when wearing lenses during the day).

Will I be able to see clearly all day? For how long?

Clear vision during the day will last for almost 16 hours.
It is of course necessary to wear your lenses every night to maintain the same quality of vision every day, because when you stop treatment, the cornea returns to its original shape after 24 to 48 hours and vision deteriorates.

Is there an adaptation period before I will be able to see clearly without wearing glasses or contact lenses during the day?

Yes. A satisfactory result can been achieved in one week for myopic patients, and in up to 15 days for hyperopic patients. This can vary from one wearer to another. In any case, you must follow your ophthalmologist’s advice.

Are night lenses difficult to look after?

No, care is not difficult but must be rigorous. You must follow your practitioner’s instructions and the recommendations for use

What do I need to use to take care of my night lenses?

Your specialist will recommend an oxidant as well as a weekly deproteinization procedure. Preservative-free, hyaluronic comfort drops are also essential for inserting and removing lenses.

Can I get up during the night while wearing my night lenses?

Yes, you will have clear vision.

Is it possible for my lenses to slip behind my eyes while I am asleep?

No. The anatomy of the eye means that a lens, whether of the day or night type, cannot pass behind the eye, as the mucosa of the eye are effectively “connected” to the eye, which makes it impossible for a lens to slip behind the eye.

My child’s myopia changes regularly. Can night lenses help?

Yes. Progressive myopia in children is one of the first indications for wearing night lenses. Most often, they enable the progression of myopia to be slowed down.

Until what age will my child have to wear Ortho K lenses to slow the progression of myopia?

Theoretically until (s)he is 18, at end of his/ her physical growth, but preferably until the end of his/ her studies.

I see halos of light, especially at the beginning. What is the explanation for this and what can be done?

It is possible to see halos as the effects of the treatment are progressive. These halos should progressively disappear. If they persist, tell your practitioner during a follow-up appointment: a readjustment of your lenses may be necessary.

What should I do if I have a problem?

If you experience redness of the eye, pain, or poor vision, you must remove your lenses and contact your practitioner.

I feel discomfort when inserting night lenses, what should I do?

Remove the lens and rinse while finger massaging it to remove any residues or dust.
If the discomfort persists, contact your specialist.