Efficacy of keratometric values obtained from Sirius topographer® in nidek axial length-scan® for intraocular lens calculation after penetrating keratoplasty

• Published in: Photodiagnosis and photodynamic therapy 2023-03, Vol.41, p.103195-103195, Article 103195
• Main Authors: Kandemir Besek, Nilay, Asık Nacaroglu, Senay, Kırgız, Ahmet, Ozturk Karabulut, Gamze, Okmen, Helin, Ahmet, Sibel
• Format: Article
• Language: English
• Subjects: Adult; Aged; Cataract surgery; Cornea - surgery; Humans; Keratoplasty, Penetrating; Lenses, Intraocular; Middle Aged; Optical biometry; Penetrating keratoplasty; Photochemotherapy - methods; Photosensitizing Agents; Retrospective Studies; Scheimpflug topography
• ISSN: 1572-1000; 1873-1597
• DOI: 10.1016/j.pdpdt.2022.103195

•Cataract is one of the reasons which Decreases visual acuity after penetrating keratoplasty (PK).•Calculation of IOL power is more difficult in eyes with PK than in eyes with naive corneas.•Studies in the literature have shown that optical biometry and Scheimpflug camera combined with Placido-disc corneal topography gives similar results in calculating IOL power in naive corneas. To evaluate the accuracy of keratometric values obtained from Scheimpflug (Sirius) topography using Nidek AL-Scan optical biometry (OB) for intraocular lens (IOL) power calculating after penetrating keratoplasty (PK). Thirty eyes of 26 patients were included in this study. The demographic information, complete ophthalmic examination, IOL calculation technique, and its effect on final refractive results were evaluated. The mean age of the patients was 52.76 ± 16.20 years. The mean K readings using Nidek AL-Scan OB, mean simulated K (SimK) (3mm), and mean pupillary power (MPP) (4.5mm) K readings using Sirius were 41.92 ± 5.05 D, 42.99 ± 5.78 D, and 43.30±6.23 D (p= 0.515). Both devices correctly calculated IOL power after PK; however, Sirius SimK (3mm) gave the lowest mean absolute error (MAE) results and can be safely used for IOL power calculation.