For the first time, ophthalmologists were able to correct high ametropia of 40 diopters cylinder

For the first time, ophthalmologists were able to correct high ametropia of 40 diopters cylinder

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First successful treatment of a visual defect with 40 diopters of cylinder value
Ametropia can take on extreme proportions in individual patients and can cause significant impairments in everyday life. In Mainz University Medical Center, specialists have now successfully achieved therapy with an artificial lens for a patient with a visual defect of 40 diopters of cylinder value.

The doctors implanted the patient with the world's strongest lens to correct an extreme visual defect, according to the Mainz University Medical Center. The lens specially made for the patient achieves a cylinder correction of 40 diopters. With the help of the special lenses, extreme ametropia can also be remedied, which was previously considered to be non-therapy-saving.

Intervention unique in the world
Surgery on the eye, in which a cloudy natural lens is replaced by an artificial intraocular lens, has become a routine achievement, according to the medical experts. However, the implantation of a lens specially made for the patient with a cylinder correction of 40 diopters was a unique event in the world. This procedure was carried out in Mainz by the head of the local refractive surgery department, private lecturer Dr. med. Urs Voßmerbäumer. The expert implanted the unique lens in a 76-year-old severely visually impaired patient who suffered from advanced cataracts and also had extreme astigmatism.

Standard lenses suitable for a maximum of 12 diopters
Just one month after the operation, the patient's visual acuity in the operated eye was already around 35 percent of the normal eyesight, according to the Mainz University Medical Center. The calculation of this personalized medical device and its implantation was, however, an enormous challenge and represented an outstanding medical achievement. By means of the implantation of a specially made intraocular lens, Dr. Voßmerbäumer corrected the astigmatism of 40 diopters. The limit for series-produced lenses is usually 12 diopters.

Extreme challenge in construction and implantation
According to the University Medical Center in Mainz, correcting such an extreme visual impairment was a challenge in several respects: First of all, an extremely precise measurement of the eye and corneal curvature was required for the production of the lens. In the second step, the special design of the extraordinarily sophisticated intraocular lens made special demands on the engineers of the Erlangen-based manufacturer. Last but not least, the implantation of the personalized medical device required the surgeon Dr. Vossmerbäumer top performances, according to the announcement of the University Medical Center Mainz.

The lens is first folded into the eye
In order to prepare for the 30-minute operation, Voßmerbäumer had planned the operation very carefully in advance and the incision had been thought through again and again, reports the Mainz University Medical Center. In addition, he had checked the folding properties of the lens several times, since the lens only fits through the fine channel of the injector system, with which it is inserted into the eye and then opens again. It was also important to determine the placement precisely before the procedure and to position the lens extremely precisely during the operation.

Extremely thick lenses are difficult to implant
"The implanted, high-performance lens is based on the standardized model of a so-called toric lens that compensates for astigmatism, but it is much thicker," explains the University Medical Center Mainz. This is an important factor in the operation, since the large lens can only be inserted into the eye when folded. For this step, Dr. Vossmerbäumer only had an approx. 2.8 mm wide cutting channel. "The successful implantation of the specially made lens is a prime example of personalized cutting-edge medicine," emphasizes Professor Dr. Norbert Pfeiffer, Director of the Eye Clinic and Polyclinic of the University Medical Center Mainz.

Extreme ametropia can also be treated
"Extreme ametropia is no longer fate," said Dr. Vossmerbäumer. Because for refractive surgery nowadays the expression of ametropia no longer has to be a limitation. In Mainz, even with extreme visual defects, patients were given the opportunity to undergo surgical, refractive treatment and thus achieve good vision. "I have made several extreme corrections in the past few years, but the implantation of the world's strongest lens of 40 diopters cylinder value was really something very special," emphasizes Dr. (fp)

Author and source information

Video: Lecture: Surgical Correction of Presbyopia (July 2022).


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