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Titel: Calculation of ocular magnification in phakic and pseudophakic eyes based on anterior segment OCT data
VerfasserIn: Langenbucher, Achim
Szentmáry, Nóra
Leydolt, Christina
Cayless, Alan
Schwarzenbacher, Luca
Zsolt Nagy, Zoltán
Menapace, Rupert
Sprache: Englisch
Titel: Ophthalmic & Physiological Optics
Bandnummer: 41
Heft: 4
Seiten: 831-841
Verlag/Plattform: Wiley
Erscheinungsjahr: 2021
Freie Schlagwörter: aniseikonia
calculation scheme
phakic eye
pseudophakic eye
retinal image size
DDC-Sachgruppe: 610 Medizin, Gesundheit
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: Purpose The purpose of this study is to develop a straightforward mathematical concept for determination of object to image magnification in both phakic and pseudophakic eyes, based on biometric measures, refractometry and data from an anterior segment optical coherence tomography (OCT). Methods We have developed a strategy for calculating ocular magnification based on axial length measurement, phakic anterior chamber and lens thickness, keratometry and crystalline lens front and back surface curvatures for the phakic eye, and axial length measurement, anterior chamber and lens thickness, keratometry and intraocular lens power, refractive index and shape factor for the pseudophakic eye. Comparing the magnification of both eyes of one individual yields aniseikonia, while comparing the preoperative and postoperative situation of one eye provides the gain or loss in ocular magnification. The applicability of this strategy is shown using a clinical example and a small case series in 78 eyes of 39 patients before and after cataract surgery. Results For the phakic eye, the refractive index of the crystalline lens was adjusted to balance the optical system. The pseudophakic eye is fully determined and we proposed three strategies for considering a potential mismatch of the data: (A) with spherical equivalent refraction, (B) with intraocular lens power and (C) with the shape factor of the lens. Magnification in the phakic eye was −0.00319 ± 0.00014 and with (A) was −0.00327 ± 0.00013, with (B) was −0.00323 ± 0.00014 and with (C) was −0.00326 ± 0.00013. With A/B/C, the magnification of the pseudophakic eye was on average 2.52 ± 2.83%/1.31 ± 2.84%/2.14 ± 2.80% larger compared with the phakic eye. Magnification changes were within a range of ±10%. Conclusions On average, ocular magnification does not change greatly after cataract surgery with implantation of an artificial lens, but in some cases, the change could be up to ±10%. If the changes are not consistent between the left and right eyes, then this could lead to post-cataract aniseikonia.
DOI der Erstveröffentlichung: 10.1111/opo.12822
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-345723
hdl:20.500.11880/31648
http://dx.doi.org/10.22028/D291-34572
ISSN: 1475-1313
0275-5408
Datum des Eintrags: 26-Aug-2021
Fakultät: M - Medizinische Fakultät
Fachrichtung: M - Augenheilkunde
Professur: M - Keiner Professur zugeordnet
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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