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1/2011
vol. 113 streszczenie artykułu:
Artykuł oryginalny
Porównanie wyników pomiarów biometrycznych uzyskanych za pomocą bezdotykowych optycznych biometrów LenStar LS 900 i IOL Master V.5
Wojciech Kołodziejczyk
1
,
Tomasz Gałecki
1
,
Monika Łazicka-Gałecka
1
,
Jerzy Szaflik
1
Klinika Oczna 2011, 113 (1): 47-51
Data publikacji online: 2011/04/17
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Evaluation of the measurement accuracy using a new optical biometer LenStar LS 900 (Haag Strait) and comparison according to the IOL Master V.5 (Zeiss) device. Materiał i metody In a prospective clinical study biometric measurements along with artificial lens power calculation using the LenStar LS 900 device were performed. A total number of 106 patients qualified for a cataract extraction procedure were included in the study. Measurements along with lens power calculation were repeated using the IOL Master V.5. device. Results were elaborated using Pearson’s correlation and Bland-Altman plot. Wyniki Measurements were performed in 204 eyes of 106 patients. Mean values and ranges of biometry results were as follows: 23.46 ± 2.81 mm [20.79-29.80] for IOL Master, and 23.47 ± 2.83 mm [20.79-29.86] for LenStar LS 900. In keratometry for flat meridian (K1) the following data was obtained: mean 43.24 ± 3.22 D [range 38.27-47.94] for IOL Master and 42.44 ± 3.15 D [38.27-47.94] for LenStar LS 900. For steep meridian (K2) the data obtained were 44.14 ± 3.40 D; [39.29-49.13] and 43.27 ± 3.34 D [38.61-48.4] respectively. The obtained calculation results for each eye were as follows: mean 21.23 ± 8.07, [range 3.25-28.99] for Hagis formula, 21.14 ± 6.90; [4.83-27.6] for SRK II, 21.04 ± 7.78; [3.05-28.05] for SRK/T, 21.09 ± 8.13; [2.43-28.61] for Holladay using IOL Master and 21.41 ± 8.23; [2.99-29.15] for Haigis; 21.24 ± 7.00; [4.6--27.71] for SRK II, 21.13 ± 7.90; [2.76-28.18] for SRK/T; 21.09 ± 8.13; [2.16-28.76] for Holladay using LenStar LS 900. Wnioski The LenStar LS 900 device enables to perform accurate and repetitive biometric measurements and implant power calculations. Implant calculation results obtained using the LenStar LS 900 device are comparable to those achieved using the IOL Master V.5 device, which has been commonly accepted as standard for over a decade. The use of both devices is limited by significant lens opacification and posterior capsule calcification. In such cases, additional ultrasound biometry should be performed. Keratometry results obtained using both devices should not be used alternatively because of the different measurement methods and different refraction indexes. The LenStar LS 900 device comparing to the IOL Master additionally enables pachymetry, macular retinal thickness, lens thickens and pupil diameter measurement. Accuracy of those measurements should be studied in the future. Introduction Evaluation of the measurement accuracy using a new optical biometer LenStar LS 900 (Haag Strait) and comparison according to the IOL Master V.5 (Zeiss) device. Material and methods In a prospective clinical study biometric measurements along with artificial lens power calculation using the LenStar LS 900 device were performed. A total number of 106 patients qualified for a cataract extraction procedure were included in the study. Measurements along with lens power calculation were repeated using the IOL Master V.5. device. Results were elaborated using Pearson’s correlation and Bland-Altman plot. Results Measurements were performed in 204 eyes of 106 patients. Mean values and ranges of biometry results were as follows: 23.46 ± 2.81 mm [20.79-29.80] for IOL Master, and 23.47 ± 2.83 mm [20.79-29.86] for LenStar LS 900. In keratometry for flat meridian (K1) the following data was obtained: mean 43.24 ± 3.22 D [range 38.27-47.94] for IOL Master and 42.44 ± 3.15 D [38.27-47.94] for LenStar LS 900. For steep meridian (K2) the data obtained were 44.14 ± 3.40 D; [39.29-49.13] and 43.27 ± 3.34 D [38.61-48.4] respectively. The obtained calculation results for each eye were as follows: mean 21.23 ± 8.07, [range 3.25-28.99] for Hagis formula, 21.14 ± 6.90; [4.83-27.6] for SRK II, 21.04 ± 7.78; [3.05-28.05] for SRK/T, 21.09 ± 8.13; [2.43-28.61] for Holladay using IOL Master and 21.41 ± 8.23; [2.99-29.15] for Haigis; 21.24 ± 7.00; [4.6--27.71] for SRK II, 21.13 ± 7.90; [2.76-28.18] for SRK/T; 21.09 ± 8.13; [2.16-28.76] for Holladay using LenStar LS 900. Conclusions The LenStar LS 900 device enables to perform accurate and repetitive biometric measurements and implant power calculations. Implant calculation results obtained using the LenStar LS 900 device are comparable to those achieved using the IOL Master V.5 device, which has been commonly accepted as standard for over a decade. The use of both devices is limited by significant lens opacification and posterior capsule calcification. In such cases, additional ultrasound biometry should be performed. Keratometry results obtained using both devices should not be used alternatively because of the different measurement methods and different refraction indexes. The LenStar LS 900 device comparing to the IOL Master additionally enables pachymetry, macular retinal thickness, lens thickens and pupil diameter measurement. Accuracy of those measurements should be studied in the future. słowa kluczowe:
IOL Master, LenStar, biometria, keratometria, obliczanie mocy soczewki wewnątrzgałkowej |
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