Comparison of different formulas for intraocular lens power calculation using a new optical biometer

Accuracy of optical biometry combined with Placido disc corneal topography for intraocular lens power calculation

“…With all tested formulas we obtained a PE within ±0.50 D higher than 87%, which is well above the 55% value established as the benchmark standard by the National Health Service of the United Kingdom [ 27 ]. Our results seem slightly better than those previously reported by Kaya et al using the same optical biometer, as they obtained 71% of eyes with a PE within ±0.50 D [ 28 ]. It is not clear if these authors optimized the constants in retrospect to get a mean zero PE, so any comparison should be done with caution.…”

Aladdin HW2.0 Optik Düşük Koherens İnterferometre ile Oküler Biyometri ve Pupillometrinin Yeniden Üretilebilirliği

“…While repeatability is defined as the variation in measurements taken by a single instrument or person under the same conditions, reproducibility is defined as whether an entire study or experiment can be reproduced under different conditions (different operators, laboratories and/or after different time intervals). 14 Similar and compatible results were reported in previous studies between the Aladdin HW2.0 and the US biometer, 6 the IOLMaster 500 (Carl Zeiss Meditec, Jena, Germany), 2,4,9,[15][16][17][18][19] the IOLMaster 700 (Carl Zeiss Meditec, Jena, Germany), 7 OA-2000 (Tomey, Nagoya, Japan), 18 the Lenstar LS 900 (Haag-Streit, Koeniz, Switzerland) 8,19 and the Sirius (Costruzione Strumenti Oftalmici, Florence, Italy), 20 The study by Mandal et al 4 was the first study to evaluate the reproducibility of AL, ACD and K readings with the Aladdin. The study by Huang et al 2 was the first study to evaluate the intra-operator repeatability of AL, ACD, K readings, and WTW with the Aladdin.…”

“…The results from other past studies showed that the Aladdin HW2.0 had high predictability and a capacity to produce accurate results. 6,[8][9][10][15][16][17][18] In our study, the interoperator reproducibility of AL, ACD, K readings, WTW and IOL power formulas was excellent in both groups. No statistically significant difference was found between the two operators' measurements, except for ACD and K1 in the cataract group (Table 2) and K2 and mesopic diameter in the healthy group (Table 3).…”

“…1,2,[5][6][7][8] With the intraocular lens (IOL) calculation module, IOL power with the conventional formulas (SRK II, SRK/T, Hoffer Q, Holladay I, Haigis), toric IOL power, multifocal IOL power and postrefractive IOL power with the Camellin-Calossi and Shammas formulas can be calculated. 1,5,6 Measurements: The subject was asked to place her/ his forehead and chin in the appropriate position on the device and look directly at the red target in the center of the 24 Placido rings. To begin with, biometric parameters and then pupillometric parameters were measured.…”

“…This device is capable of screening the corneal surface for keratoconus probability. [1][2][3][4][5][6][7] There were few studies about the reproducibility and repeatability of the Aladdin HW2.0. 2,4,[8][9][10] The study aimed to evaluate the inter-operator reproducibility of biometry and pupillometry with the Aladdin HW2.0 biometer in patients with cataracts and healthy subjects.…”