Guoji Yanke Zazhi (Jul 2020)

Study on the measurement formula of intraocular lens in primary hospitals of minority areas

  • Guo-Yan Zeng,
  • Han-Tao Lyu,
  • Hai-Tao Zhang,
  • Gui-Qiong Fan,
  • Hai-Xia Zhang,
  • Jin-Peng Cui,
  • Hong Zhang

DOI
https://doi.org/10.3980/j.issn.1672-5123.2020.7.27
Journal volume & issue
Vol. 20, no. 7
pp. 1241 – 1244

Abstract

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AIM: To compare and study the differences of eyeball biometric measurements among Han, Hani and Yi nationality in Honghe Hani and Yi Autonomous Prefecture(Honghe Prefecture), and prediction accuracy of the intraocular lens(IOL)degree by SRK-T and Haigis formulas in the different eye axes, to provide further objective clinical evidence for the majority of basic-level hospitals and the blind prevention and treatment projects in minority areas.METHODS: Selected 186 cases(200 eyes)cataract patients in our department, divided them into three groups according to different nations, get their eyeball biometric measurements(ocular axial length, anterior chamber depth and corneal curvature)by A-ultrasound combined with corneal curvature meter and corneal topography, and then compared the differences. According to the different eye axes, they were divided into three groups and then randomly divided into two groups. SRK-T and Haigis formulas were used to predict the IOL degree, and collected postoperative optometry results, calculated the absolute prediction error, then conducted statistical analysis. RESULTS: There were no difference in the mean axial length, mean anterior chamber depth and mean corneal curvature(measured respectively by corneal topography and corneal keratometer)in the different ethnic groups(P>0.05), and the mean corneal curvature measured by the two methods had no difference(P>0.05). There were no difference of the mean corneal curvature measured by the two methods in the three axial eye groups(P>0.05)and in the same axial eye group(P>0.05). There were no difference in the absolute error of the two IOL measurement formulas in the three eye axis groups(P>0.05). The absolute error calculated by SRK-T formula for the short and the middle eye axis groups were smaller, while it calculated by Haigis formula for long eye axis group was smaller.CONCLUSION: In our department, there are no statistical difference in the eye biometrics of Han, Yi and Hani nationality. Corneal curvature measured by corneal topography and corneal keratometer have no significant difference. SRK-T and Haigis formula both have high predictive value for IOL degree, SRK-T formula has smaller predictive error for patients which with short and middle eye axis, and Haigis formula has better predictive value for the long ones.

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