Abstract
ABSTRACT Objective: To evaluate the correlation of optical biometry and target with variable ages, anterior chamber depth, axial length, R1/K1 and R2/K2 established by two optical biometry devices in patients with cataract. Methods: The study included the analysis of 348 medical records, from which 503 cataract eyes were selected, which underwent evaluation by the optical biometric devices IOL Master 700 and Lenstar LS 900 in the period of April to July 2017. Data collected were: age, anterior chamber depth, axial length, R1/K1 and R2/K2. Results: The average of the biometrics obtained using Lenstar was 21.02, varying 3.46, more or less, with an average target of -0.02, varying 0.45. In relation to the IOL Master it was 21.19, with a variation of 3.40 and average target of -0.01, a variation of 0.11. It can be observed that despite close values in relation to the mean, there was significance (p<0.001). Axial length (p<0.001) and R1/K1 (p<0.001) had an influence on the difference of the biometric values between the devices. Conclusion: A high degree of clinical and statistical correspondence was observed between the results obtained by the biometry devices in patients with cataract.
Highlights
According to data from the latest WHO survey on blindness, in 2010, 285 million people with visual disabilities worldwide were identified, 90% live in developing countries and out of 5 individuals with this problem, 4 derive from avoidable causes,(1) such as glaucoma, trachoma, uncorrected refractive errors, diabetic retinopathy and cataract, which is considered the greatest avoidable condition of blindness in the world. [2]In Brazil, according to data from the Brazilian Council of Ophthalmology (CBO) published in 2012 on ocular health conditions, it is estimated that there are 1,158 million people with reversible blindness in Brazil, with a higher prevalence in the age group over 50 years
The development of new technologies has implemented the results obtained in cataract surgery over the last few years, highlighting the procedure that previously had an exclusive role of visual rehabilitation to a panorama of true refractive surgery, [7] in which the main purpose would not be to overcome morbidity, but rather to obtain a precise postoperative target refraction, clinically translating this result into optimized visual acuity. [8]
Optical biometry is one of the main tools available in the preoperative evaluation of cataract surgery, and one of the ones that has undergone more technological improvements, having as a functional feature in the surgical planning the establishment of an effective site in relation to which the intraocular lens (IOL) would be inserted, in order to increase the power of the lens, reaching a postoperative refraction capable of providing visual acuity probably better for the individual submitted to the procedure. [8,9]
Summary
According to data from the latest WHO survey on blindness, in 2010, 285 million people with visual disabilities worldwide were identified, 90% live in developing countries and out of 5 individuals with this problem, 4 derive from avoidable causes,(1) such as glaucoma, trachoma, uncorrected refractive errors, diabetic retinopathy and cataract, which is considered the greatest avoidable condition of blindness in the world. [2]In Brazil, according to data from the Brazilian Council of Ophthalmology (CBO) published in 2012 on ocular health conditions, it is estimated that there are 1,158 million people with reversible blindness in Brazil, with a higher prevalence in the age group over 50 years. In the calculation of this measurement, biometers released in recent years such as the Lenner LS 900 produced by Alcon and the IOL Master 700 produced by Zeiss, have similar variables that compose the analysis of these ocular parameters, the main ones being: axial length (AL - axial length), anterior chamber depth (ACD – anterior chamber depth), thickness of crystalline lens (LT- lens thickness), central corneal thickness (CCT – central corneal thickness) and corneal rays (R1 - radius of anterior corneal curvature; R2 - radius of the posterior curvature of the cornea) Besides this analysis, some researchers consider other variables, such as the age and gender of the individual, that subjectively influence the final computation. Noting that disagreements between the devices under analysis, and generally only one of them is used in the preoperative assessment of cataract surgery, may re-signify the individual’s visual acuity in order to establish a standard of excellence that is increasingly required in this surgical procedure
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