Comparison of Three Intraocular Lens Calculation Formulas
Journal of Clinical and Experimental Ophthalmology is a journal which provides rapid peer-review process with 6 issues per year (Bi Monthly). Journal of Clinical and Experimental Ophthalmology accepts all types of articles including case-reports, research, review, case-series, mini-review, opinion articles, short communications, commentary, perspective and video articles.
Journal of Clinical and Experimental Ophthalmology has recently release its 3rd issue in 2020 with 6 articles and 3 Research articles, 2 case reports and a short communication. Here we are mentioning about the case report entitled “Comparison of Three Intraocular Lens Calculation Formulas for Predicting Postoperative Diopter in Patients with Cataract and High Myopia” written and submitted by Tian Ni whose abstract was as follows:
Objective: To evaluate the accuracy of three calculation formulas of intraocular lens (IOL) on the refractive state of cataract patients with high myopia after cataract surgery, to study the influence of three formulas on axial length (AL), and to verify the advantage of Olsen formula over SRK/T and Haigis formula in predicting postoperative refraction in patients with high myopia and cataract, so as to provide a basis for selecting the degree of IOL in cataract patients with high myopia, so as to provide a basis for selecting the degree of IOL in cataract patients with high myopia. Methods We collected the data of sex, age, axial length, predicted value of SRK/T, Haigis, Olsen formula and postoperative true diopter of 101eyes of 10z eyes hospitalized in the First Affiliated Hospital of Guangzhou University of Chinese Medicine from 2016-10-10 to 2019-8-20. 101 cases were divided into three groups according to the AL. The prediction accuracy of the three formulas for different eye axis length was evaluated respectively,and the stability of the same formula for the prediction of different axial lengths was compared. Results Within the range of 26mm0.05) and there was significant difference between Olsen formula with SRK/T formula and Olsen formula and Haigis formula(p30mm, the comparison of the three formulas was statistically significant. SRK/T formula showed significant difference in eye axis length among the three groups(p
High myopia and its complications are one of the eye diseases that seriously threaten human vision[1-3]. Among several complications, high myopia with cataract is one of the main diseases causing blindness. Epidemiological surveys show that the prevalence rate of high myopia is 0.53% in central India[4], 2.7% in Europe[5], and 8.4% in Singapore, and the prevalence rate of high myopia of ethnic Chinese is significantly higher than that of Malays and Indians[6]. At present, the main treatment of high myopia with cataract is phacoemulsification combined with intraocular lens implantation. Studies have proved that the commonly used clinical formulas such as SRK/T and Haigis formula can not accurately predict the postoperative diopter of patients[7], and there is a common phenomenon of hyperopia drift after surgery[8]. As the representative of the fifth generation intraocular lens power calculation formula, Olsen formula can predict the effective position of intraocular lens by preoperative anterior chamber depth and lens thickness, which is expected to provide more accurate prediction of postoperative refractive state for cataract with high myopia[9]. In this study, through the comparison of three formulas of SRK/T, Haigis and Olsen in different eye axial length(AL), to evaluate the accuracy and stability of the three formulas in the prediction of postoperative diopter in patients with high myopia and cataract, and to provide a reliable basis for the selection of clinical intraocular lens diopter. The results are reported as follows.
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