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Department of ophthalmology

Prof. Dr. med. Marcus Knorr

About the department

The ophthalmology department at Helios Hospital Krefeld offers the whole spectrum of modern diagnostic procedures and all treatment options for patients with eye diseases. The main focus of the department is the treatment of cataracts. The cataract centre of the department uses all the possibilities of modern cataract surgery, high-precision diagnostic and measurement methods, and the latest surgical technologies. The department has all modern diagnostic techniques (including optical coherence tomography, fluorescein angiography and autofluorescence examination). The use of advanced artificial eye lenses and many years of extensive experience of surgeons guarantee the gentle and safe treatment of patients. As part of the coordinating centre of the Eye Clinic, doctors perform more than 1,000 operations per year on the eyelids, orbit and, in cooperation with the ENT Clinic, on the lacrimal ducts.

In addition to cataracts, the department's main activities include the treatment of glaucoma, diseases of the retina, vitreous body, cornea, and strabismus. The range of services consists of all medical procedures of plastic-reconstructive eyelid surgery and cosmetic-aesthetic eyelid surgery.

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Treatment and diagnostic focus of the department


  • Cataract 
  • Retinal disorders 
  • Glaucoma 
  • Corneal diseases
  • Inflammatory diseases of the veins and eye sockets
  • Entropion, ectropion
  • Benign and malignant eyelid tumours
  • Endocrine ophthalmopathy
  • Ptosis
  • Strabismus


  • Anamnesis
  • Physical examination
  • Laboratory diagnostics
  • Optical coherence tomography (uses light waves to take cross-section pictures of retina)
  • Fluorescent angiography
  • Autofluorescent study
  • Perimetry (review of visual fields)
  • Heidelberg retinal tomography (used for precise observation and documentation of the optic nerve head)
  • Pachymetry (simple, quick, and painless examination used to measure the thickness of the cornea)
  • Pentacam test 


  • Laser treatment
  • Injection of drugs into the vitreous body of the eye
  • Surgical treatment of diseases of the retina and vitreous body
  • Reconstructive eyeball surgery
  • Iris surgery
  • Treatment of retinopathy of prematurity
  • Trabeculectomy, goniotrepanation
  • Eyelid сorrection
  • Cosmetic and aesthetic surgery of the eyelids
  • Corrective surgery after paralysis of the facial muscles
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Doctor profile


  • 1978 - 1984 Study of Medicine at the Westphalian Wilhelm University of Münster
  • 1984 Defense of doctoral dissertation, Internal Medicine


  • 1985 - 1986 University Hospital Zurich, Polyclinic
  • 1987 -1987 University Hospital Münster, Polyclinic
  • 1987 Department of Ophthalmology, University Hospital Tübingen
  • 1992 Medical Specialist in Ophthalmology
  • 1994 Defense of doctoral dissertation, Ophthalmology, Tubingen University
  • 1994 Venia Legendi, Ophthalmology
  • 2000 Visiting Professor, Ophthalmology, Tubingen University
  • 2000 Chief Physician of the Department of Ophthalmology at the Municipal Hospital Krefeld
  • Since 2008 Chief Physician of the Department of Adult and Pediatric Ophthalmology at the Helios Clinic Krefeld

Awards, memberships, publications

  • Member of the German Society of Ophthalmology
  • Member of the German Society for Intraocular Lens Implantation
  • Member of the European Society of Cataract and Refractive Surgery
  • Member of the Federation of German Ophthalmic Surgeons
  • Deputy Commissioner of the Advisory Committee on Errors in the Treatment of the Medical Association of the North Rhine
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