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首页> 外文期刊>Journal of Clinical Sciences >Comparison of autorefractor with focometer in patients with refractive errors attending Lagos University Teaching Hospital, Lagos, Nigeria - A cross sectional survey
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Comparison of autorefractor with focometer in patients with refractive errors attending Lagos University Teaching Hospital, Lagos, Nigeria - A cross sectional survey

机译：对尼日罗斯拉各斯大学教学医院屈光屈光屈光屈光屈光度折射率的近外反差异器的比较 - 横断面调查

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Background: Uncorrected refractive error is the most common cause of visual impairment globally. Yet, there is paucity of refractionists in rural areas of most developing countries. Thus, there is a need for a cost effective but accurate method of refraction that could be used by rural health workers with minimal training. To compare refractive error measurements of autorefractor with that of focometer with a view to determining the accuracy and reliability of focometer. Methods: This was a comparative cross-sectional study conducted among patients with refractive errors attending the Guinness Eye Centre Clinic, Lagos University Teaching Hospital, Lagos, Nigeria. Consecutively consenting patients who met the eligibility criteria were recruited until the sample size was attained. All participants had a standardized protocol examination including visual acuity assessment and ocular examination. Refractive error was measured using the autorefractor, focometer and subjective refraction in both eyes of each participant. Comparison was done based on the means of variables of autorefractor, subjective refraction and focometer measurements using the paired-sample t-tests, Pearson's correlation and linear regression. Agreement between the measurements was investigated using the Bland-Altman analysis and reliability of the repeated measurements tested with Cronbach's alpha. The analysis was considered statistically significant when the P 0.05. Results: Four hundred eyes of 200 patients were analyzed in this study. The mean age of respondents was 45.1 ± 16.3yrs and the male:female ratio was 1: 2.1. There was a statistically significant difference between the mean spherical (P 0.001) and cylindrical (P 0.001) readings of the focometer and autorefractor. However, the mean difference between the spherical equivalent of focometer and that of the autorefractor was not statistically significant (P = 0.66). Pearson correlation coefficient was high for the compared methods of refraction as both the bivariate linear regression between the autorefractor and focometer, and that between the subjective refraction and focometer showed good linearity. Bland-Altman plot showed good agreement between the mean focometer measurements with both the autorefractor (mean difference = 0.02 ± 0.85 DS; mean difference ± 1.96 standard deviation [SD] = 1.69 to ? 1.65 DS) and subjective refractive (mean difference = 0.06 ± 0.72 DS; mean difference ± 1.96 SD = 1.49 to ? 1.36 DS) measurements. Cronbach's alpha showed good reliability of focometer and autorefractor repeated measurements. Conclusion: This study showed a good correlation and agreement between focometer and autorefractor. Hence, focometer could be used for refraction in low resource settings where locals could be trained in its use.
机译：背景：未经校正的屈光误差是全球视觉损伤最常见的原因。然而，大多数发展中国家的农村地区都有贫困者。因此，需要一种经济效益但准确的折射方法，可以通过培训最小的农村卫生工作者使用。将自动反式的折射误差测量与Focomator的折射率测量进行比较，以确定测心值的准确性和可靠性。方法：这是参加吉斯大学教学医院，拉各斯，尼日利亚拉各斯的折射误差患者的比较横截面研究。招募符合资格标准的患者连续同意，直到达到样品规模。所有参与者都有一个标准化的协议检查，包括视力评估和眼科检查。使用每位参与者的两只眼睛的自动除球器，点心和主观折射测量屈光误差。使用配对样本T检验，Pearson的相关性和线性回归是基于AutoRefractor，主观折射和点测量测量的变量的方法来完成比较。使用Bland-Altman分析和使用Cronbach的alpha测试的重复测量的可靠性来研究测量之间的协议。当P＆ 0.05。结果：本研究分析了200名患者的四百只眼睛。受访者的平均年龄为45.1±16.33毫秒，男性：女性比例为1：2.1。在聚焦和自动反式的平均球形（P <0.001）和圆柱形（P <0.001）读数之间存在统计学上的显着差异。然而，光学仪的球形当量与自动反式非球体的球形等同物之间的平均差异在统计学上没有统计学意义（P = 0.66）。 Pearson相关系数对于比较的折射方法很高，因为自动除载器和注射仪之间的双变量线性回归，以及主观折射和配方仪之间的良好线性。 Bland-Altman Plot在AutoReFractor（平均差异= 0.02±0.85ds之间的平均点心测量之间显示出良好的一致性;平均差值±1.96标准差[SD] = 1.69至？1.65 DS）和主观折射（平均差异= 0.06± 0.72 ds;平均差异±1.96 sd = 1.49至？1.36 ds）测量。 Cronbach的alpha显示出的注射值和自动反复器重复测量的良好可靠性。结论：该研究表明，对焦仪和自动反式非球员之间的相关性和一致性。因此，配方仪可用于低资源设置中的折射，其中当地人可以在其使用中培训。

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