gms | German Medical Science

32. Internationaler Kongress der Deutschen Ophthalmochirurgen (DOC)

23.05. - 25.05.2019, Nürnberg

Calculating the Human Eye – The Evolution of Biometry for Cataract Surgery

Meeting Abstract

Suche in Medline nach

  • Sibylle Scholtz - Universitätsaugenklinik Heidelberg, International Vision Correction Research Centre, Ettlingen
  • Achim Langenbucher - Medizinische Fakultät der Universität des Saarlandes, Experimentelle Ophthalmologie, Homburg/Saar

32. Internationaler Kongress der Deutschen Ophthalmochirurgen. Nürnberg, 23.-25.05.2019. Düsseldorf: German Medical Science GMS Publishing House; 2019. DocPOB 1.1

doi: 10.3205/19doc095, urn:nbn:de:0183-19doc0952

Veröffentlicht: 14. Mai 2019

© 2019 Scholtz et al.
Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung). Lizenz-Angaben siehe http://creativecommons.org/licenses/by/4.0/.


Gliederung

Text

Introduction: Optical biometry is the standard diagnostic tool and essential basis for IOL calculation prior to cataract surgery today. Our poster will provide a short overview of the historical development of biometry of the human eye and the formulas used for IOL calculation.

Material and Methods: Selective literature search in books and journal articles via PubMed, Google Scholar and Google as well as close cooperation with IOLCon at University Homburg/Saar (Germany).

Results: For first measurements of the eye ultrasound was applied invasively. Today, ultrasound is mostly restricted to cases where optical biometry cannot be performed due to opaque optical media. However, today most of the modern biometers are working with OCT non-invasively. Along with this technical evolution numerous formulas have been developed for calculating the optical power of each respective IOL. Intraocular lenses cam be calculated with different strategies: with empirical formulas tje IOL power is derived from a series of biometric data without any anatomical or physical background. With the theoretical-optical formulas, which are most commonly used today, the IOL power is extracted from a paraxial optical model which simplifies the eye to linear Gaussian optics. With modern raytracing setting, the Snell’s law is applied at each refracting surface within the eye and the best focus position is compared with the position of the fovea.

Conclusions: Today, an increasing number of eyes that underwent refractive surgery previously is facing cataract surgery. Maybe even more important than adequate biometry of the human eye will be using appropriate calculation schemes helping to enhance post cataract refractive outcome or predictability.