Comparação de dois aparelhos de biometria óptica no cálculo da lente intraocular em pacientes com ceratocone

Abstract

The purposes of this study were to compare and correlate the biometric parameters obtained by the devices, IOLMaster 700 and Lenstar LS 900, in patients with keratoconus; and to verify which parameter interferes most in the calculation of the power of the intraocular lens (IOL) in these patients. Sixty eyes of patients aged 18 years or older with keratoconus were prospectively evaluated using corneal tomographic criteria, who had not undergone any previous corneal surgical procedure and without any corneal opacity, originating from the Ophthalmology Reference Center (CEROF) of the Federal University of Goiás (UFG) from April 2023 to August 2023. The following biometric data were compared between the devices: axial diameter (AL), flattest keratometry (K1), most curved keratometry (K2), corneal astigmatism (ASTIG), anterior chamber depth (ACD) and calculation of the intraocular lens (IOL) power. The comparison of means and agreement analysis between the devices was tested using the paired t-test and Pearson's correlation analysis, respectively. The correlation between IOL Master and Lenstar was positive, with r > 0.85 in all parameters evaluated. There was a statistically significant difference in the evaluation of the means between the biometric parameters evaluated (K1, K2, ASTIG, ACD and LIO) in the t-test with p<0.001, with no statistically significant difference in relation to the AL parameter. In the multiple linear regression analysis, K2 was the main factor responsible for the variation in LIO values between the biometers with t of 2.93 and p<0.001. It is concluded that there is a discrepancy between the parameters evaluated through the biometers in patients with keratoconus, with a consequent difference in the LIO power, which may result in future postoperative refractive error. Therefore, the IOL Master 700 and Lenstar LS900 devices are not coincident in these patients