Keraring -
Femto-laser assited intracorneal incision

Kerarings are intracorneal ring segments (ICRS) for treating irregular astigmatisms due to keratokonus or keratotorus (PMD).

This corneal disease will cause the normally “spherical” curvature of the cornea to become “conical”. In an advanced stage, the cornea will become thinner and thinner and your vision will deteriorate.

Hornhautverkrümmung bei Keratokonus
Astigmatism in keratoconus

In many cases, a keraring implantation with the femtosecond laser will be able to treat this disease even at advanced stages. In general, the implants will enable a geometric normalisation of the cornea and therefore a more stable vision.

The latest generation of the ring segments distinguish themselves through a high product variety, optimised geometry and in particular ingenious calculations which are not carried out by standardised algorithms but experienced experts.
The prism geometry of the kerarings are extremely successful at preventing patients from perceiving any scattering and ensure the optimal effect of the implant in the cornea.



  • Personal, unbinding consultation
    • Measurement of all relevant eye parameters
    • Testing whether your eyes are suited for the Keraring procedure

  • Comprehensive medical preliminary examination
    • This will generally take 1 1/2 to 2 hours
    • Intensive preliminary examination and measurement of your eyes by an eye specialist
    • Detailed information on the further procedure by an eye specialist
    • It is important that you do not wear any soft contact lenses for one week or any hard contact lenses for two weeks before the appointment
    • Please note that you will not be allowed to drive a vehicle after the examination – neither a car, motorcycle or bicycle. We recommend to arrange a friend or family member to pick you up. If this is not possible, we will be happy to call you a taxi.

  • On the day of your keraring surgery
    • We recommend you to wear conformable clothing on the day of your keraring surgery
    • You can eat and drink as normal on the day of your surgery, you should however not smoke
    • For reasons of hygiene, it is important that you wash your face thoroughly and do not wear any make-up or perfume
    • Anaesthesia is achieved using drops
    • Outpatient procedure, no eye dressing, sunglasses recommended
    • Total duration of the operation (one eye): approx. 20 min.
    • After the operation, you will not be allowed to drive a car

  • After the keraring operation
    • The eye may appear a little red after the operation – please do not rub your eye
    • The application of an artificial tear substitute, a combination product which also acts as a prophylaxis against swelling and inflammation, as well as eye drops against pain will be discussed with you by your doctor in advance
    • You will be able to work again after two days
    • Follow-up examination will be schedule for one day, one week and one month after the surgery
    • You will only be permitted to drive a car again after receiving the go-ahead by your doctor

DOmed eyclinic Westfalen
Dortmund B1

Rheinlanddamm 199
44139 Dortmund
Fon. +49231 – 95 80 93 10

Private consultation & outpatient operations

DOmed dry eye center
Dortmund B1

Rheinlanddamm 199
44139 Dortmund
Fon. +49231 – 95 80 93 10

Private outpatient diagnosis and treatment

DOmed eye center

Hakortstr. 64
44245 Dortmund-Hombruch
Fon. +49231 – 71 71 38

Medical consultation hours & private consultation hours

DOmed eye center

44534 Lünen
Fon. +492306 – 75 68 50

Medical consultation hours, private consultation hours
& outpatient operations

DOmed private practice
Dortmund center

Wißstr. 9
44137 Dortmund-center
Fon. +49231 – 57 10 88

Private consultation

DOmed eye center

Am Kai 8
44263 Dortmund
Fon. +49231 – 477 98 400

Medical consultation hours & private consultation hours