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    Relative peripheral refraction and its role in myopia onset in teenage students

    2022-07-30 10:03:44LinSongQiLuYaoXueFengWangJinZhaoYongLiuTengYunWuQingHongYangChenZhaoZhiKangZou
    關(guān)鍵詞:漢譯普惠頁巖

    INTRODUCTION

    Myopia is an important and widespread public health problem, especially in Asia

    . Although myopia is known to be caused by both genetic and environmental factors,the ocular components, such as the axial length, cornea, and crystalline lens, are regarded as the primary determinants of refractive error and are also related to myopia incidence and progression

    . Our previous studies show that the incidence of myopia in high school students remains high and is related to low outdoor time and high near-work time

    . It is necessary to predict the incidence of myopia in advance; however, reliable indicators of this condition are lacking.

    Currently, the role of peripheral refraction in incident myopia and myopic progression has been the focus of much research

    , and myopic eyes have been found to exhibit relative peripheral hyperopia when compared with nonmyopic eyes

    . Several animal studies have supported the role of peripheral refraction in myopia incidence. The studies in monkeys by Smith

    found that the peripheral retina contributed to emmetropization and myopia onset; even when the central retina was blocked or ablated by a laser,emmetropization was able to progress in young monkeys, but if a lens was applied to induce relative peripheral hyperopia,central myopia occurred. However, contradictory findings to those of the above animal studies have been reported by studies about the relationship between peripheral refraction and myopia development in humans. Atchison

    claimed that there was no significant difference in the initial peripheral hyperopia between eyes that developed myopia and those that remained non-myopic after 2y in 7-year-old and 14-yearold Chinese children. The authors concluded that relative peripheral hyperopia does not predict the progression of myopia. Mutti

    found that relative peripheral hyperopia at the 30° nasal visual field angle had little effect on the risk of myopia onset during the next 5y in 9-year-old children. A study conducted by Sng

    in 7-year-old Singaporean Chinese children revealed that emmetropic children who did not develop myopia during the next 15mo had relative peripheral myopia. Furthermore, a similar study in 6- to 9-year-old Chinese children found that the baseline relative peripheral refraction had no significant correlation with myopic central refractive changes during 12mo of follow-up

    .

    (3)提高鉆井液的抑制性,防止泥頁巖吸水膨脹。加深井段鉆遇地層一般為泥頁巖發(fā)育,容易造成水侵,頁巖膨脹,進而發(fā)生掉塊坍塌,在施工中加入足量的防塌劑、降濾失劑和護壁性能比較強的磺化瀝青等處理劑,降低濾餅滲透率,增強封堵承壓能力,抑制硬脆性地層掉塊、剝落、坍塌。

    At the baseline, the relative peripheral refraction in the myopic group did not significantly differ from that in the E0-E2, H0-E2, and H0-H2 groups (

    >0.05; Figure 2C). At the follow-up examination, the relative peripheral refraction at 20° N was significantly more hyperopic in the myopic group than in the E0-E2, H0-E2, and H0-H2 groups (

    <0.01), while the relative peripheral refraction at 10° N was significantly more hyperopic in the myopic group than in the H0-H2 group (

    <0.01; Figure 2D). The relative peripheral refraction at ±10° and ±20° did not significantly differ among the E0-E2, H0-E2, and H0-H2 groups (

    >0.05).

    SUBJECTS AND METHODS

    Ethical Approval The study protocol was approved by the Ethics Committee of Air Force Medical Center and adhered to the provisions of the Declaration of Helsinki. The purpose and content of the study were explained to the students and their parents and written and oral consent was obtained from the students and their parents.

    Study Population We randomly enrolled 85 participants aged 14-16y from a selected group of male teenage Chinese students in the Experimental Class of the Air Force

    in November 2017 and followed them up for 2y until November 2019. The inclusion criteria were as follows: uncorrected Snellen visual acuity 20/20 or better in both eyes and spherical equivalent refraction (SER) between -0.25 and +2.00 D and cylindrical refraction not more than 1.00 D in both eyes. The SER was calculated as the spherical power plus half of the cylindrical power after cycloplegia. The exclusion criteria were a history of ocular surgery, ocular trauma, or an ocular disease that affected the vision.

    Changes in Peripheral and Central Refraction and Their Related Factors Relative peripheral refraction and central refraction changes of four subgroups in 2y were shown in Table 5. In general, the changes in relative peripheral refraction at different visual field angles increased as the changes in central refraction increased (Figure 3). The amplitudes of central refractive changes in the myopia and H0-E2 groups were significantly higher than those in the E0-E2 and H0-H2 groups (

    <0.05); however, the differences between these changes in the myopia and H0-E2 groups were not significant (

    >0.05). The amplitude of relative peripheral refraction change at 20° N was significantly higher in the myopia group than in the E0-E2 group (

    =0.001) and the H0-H2 group (

    =0.0001). The amplitude of relative peripheral refraction change at 20° T was significantly higher in the myopia group than in the H0-H2 group (

    =0.0001), while that at 10° T was significantly higher in the myopia group than in the E0-E2 group (

    =0.039). The amplitudes of relative peripheral refraction changes at ±20° were significantly higher in the H0-E2 group than in the H0-H2 group (

    =0.006 and 0.0001, respectively).

    As the PRN code-phase observables ofand,the mean and standard deviation of the carrier-phase observablesandgenerated by the PLL can be expressed as:

    Measurements In this longitudinal study, all participants were examined at the baseline and at a follow-up visit 2y later. Peripheral refraction was measured with an open-field autorefractor (WAM5500; Grand Seiko, Hiroshima,Japan)

    . The pupils were dilated by instilling one drop of 0.5% tropicamide-phenylephrine ophthalmic solution(Mydrin-P; Santen, Osaka, Japan) every 5min for 20min in both eyes

    . The peripheral refraction examination was performed 20min after the drug administration. Peripheral refraction was measured in the horizontal meridian at 0°, ±10°,and ±20°; central refraction was tested first, followed by nasal and temporal peripheral refraction. Only the right eyes of the participants were included in the analysis.

    Classification Myopia was defined as a central SER of -0.50 D or less, while -0.50 D<SER<+0.50 D indicated emmetropia,and SER≥+0.50 D indicated hyperopia. At the baseline, 30 students were hyperopic, and 55 students were emmetropic.Students were considered to have incident myopia if they were found to have developed myopia at the follow-up examination;non-myopic students were those who remained non-myopic at the follow-up examination.

    Despite the strong evidence for the role of peripheral refraction in myopia onset in animal experiments, clinical studies have revealed only a weak effect of the peripheral retina. Moreover,few studies have explored the peripheral refractive status in non-myopic children over the age of 14y, by which time it is believed that the progression of myopia will be slower.Therefore, the purpose of this study was to identify the peripheral refraction characteristics and determine the role of peripheral refraction in myopia development in a group of selected male senior high school children aged 14 to 16y over a 2-year follow-up period.

    For further analysis, the participants were divided into four subgroups: students who were hyperopic or emmetropic at the baseline but were myopic at 2y (incident myopia), students who were hyperopic at the baseline but were emmetropic at 2y(H0-E2), students who remained hyperopic at 2y (H0-H2), and students who remained emmetropic at 2y (E0-E2).

    由以上兩組對比可知,在最優(yōu)路線的求解上,本文算法相比較于文獻[12]中的算法具有一定優(yōu)勢,驗證了本文算法的優(yōu)勢性。

    Statistical Analysis Statistical analyses were performed using the Statistical Package for the Social Sciences for Windows software, version 24.0 (SPSS Inc., Chicago, IL,USA). Continuous variables were presented as mean±standard deviation (SD) or 95% confidence intervals (95%CI).Peripheral refraction and relative peripheral refraction values were compared using repeated-measures analysis of variance,followed by Bonferroni post hoc tests. The Spearman rank test was performed to analyze the correlation between the changes in relative peripheral refraction and the changes in central refraction. Multiple linear regression analyses were conducted to investigate the association between the changes in relative peripheral refraction and the changes in central refraction. Multivariate Logistic regression analysis was performed to assess the correlation of incident myopia with the baseline central refraction and the baseline relative peripheral refraction. All

    values were two-sided and were considered statistically significant when less than 0.05.

    RESULTS

    General Information We enrolled 89 participants aged 14-16y in November 2017. Four students did not complete the peripheral refraction examination at the 2-year follow-up. Thus,a total of 85 male students with a mean age of 15.47±0.57y were included in this study. The average central refraction of the students was 0.23±0.36 D at the baseline and 0.08±0.45 D at the 2-year follow-up, and there was no significant differencein cylindrical refraction between baseline (0.39±0.30 D) and 2-year follow-up (0.42±0.28 D,

    =0.44). Of the 85 students,13 were found to have developed myopia at the follow-up examination.

    2006年,普惠金融的概念正式引入我國,國家允許成立各種農(nóng)村金融機構(gòu),積極推進金融改革和發(fā)展,服務(wù)于國計民生。國家 “十二五”發(fā)展規(guī)劃也將完善農(nóng)村金融體系建設(shè)作為重點。2013年,十八屆三中全會正式提出了“發(fā)展普惠金融,鼓勵金融創(chuàng)新,豐富金融市場層次和產(chǎn)品”。2015年的《推進普惠金融發(fā)展規(guī)劃(2016-2020年)》制定了推進我國普惠金融發(fā)展的總體思路和詳細發(fā)展路線圖。該規(guī)劃體現(xiàn)了我國對發(fā)展普惠金融的全面戰(zhàn)略布局和支持,將普惠金融的發(fā)展推進到一個嶄新的發(fā)展時期。

    所有數(shù)據(jù)以x±s表示,應(yīng)用SPSS17.0軟件,兩均數(shù)比較用t檢驗,多組間比較用單因素方差分析,P<0.05有統(tǒng)計學(xué)意義。

    Differences Among the Four Subgroups Non-myopic students were divided into the following three subgroups: H0-H2 (

    =17), H0-E2 (

    =13), and E0-E2 (

    =42). Tables 3 and 4 show the peripheral refraction and relative peripheral refraction in these three subgroups at the baseline and the 2-year followup. In the H0-H2 group, neither the peripheral refraction nor the relative peripheral refraction significantly differed between the baseline and follow-up (

    >0.05). In the E0-E2 group,the peripheral refraction and relative peripheral refraction significantly differed between the baseline and follow-up only at 20° N (

    <0.01). In the H0-E2 group, however, peripheral refraction changed significantly from the baseline to the follow-up at 0°, ±10°, and 20° T (

    <0.05), while the relative peripheral refraction changed significantly at ±20° and 10° N(

    <0.05).

    This study explored the characteristics of peripheral refraction and relative peripheral refraction in a group of selected male Chinese children aged 14 to 16 years old and tested the hypothesis that relative peripheral hyperopia predicts myopia onset. Our results showed that there was no significant difference in relative peripheral refraction between myopic eyes and non-myopic eyes at the baseline. After 2y, the relative peripheral refractions of students who became myopic turned hyperopic and those of non-myopic students remained relatively myopic or emmetropic. The relative peripheral refraction at 10° T, 10° N, and 20° N significantly differed between the myopic and non-myopic groups. These results are consistent with previously reported data

    , which showed that relative peripheral hyperopia might correlate with myopia onset; however, it is unclear if this relationship is causal or merely a correlation, at least in our 2-year follow-up study.

    局部應(yīng)用前列腺素類似物滴眼液對原發(fā)性開角型青光眼患者角膜厚度影響的Meta分析 ………………… 蔣鵬飛等(24):3431

    斗轉(zhuǎn)星移,隨著人民幣幣值穩(wěn)固、外匯儲備水平堅實,預(yù)計人民幣國際化窗口將再次開啟。預(yù)期人民幣資本項目可兌換將成為自貿(mào)港內(nèi)金融制度創(chuàng)新的核心,從而實現(xiàn)自貿(mào)區(qū)試點未盡目標。深入推進跨境貿(mào)易人民幣結(jié)算作為自貿(mào)港金融開放創(chuàng)新的重要任務(wù),將進一步擴大人民幣跨境使用,繼續(xù)擴大試點企業(yè)的規(guī)模。擴大跨國公司總部外匯資金集中運營管理試點企業(yè)范圍,進一步簡化外部資金池管理,促進貿(mào)易投資便利化。

    The change in central refraction was significantly correlated with the changes in the relative peripheral refraction at 20°N (

    =-0.58,

    =0.0001), 20° T (

    =-0.47,

    =0.0001), 10° N(

    =-0.46,

    =0.0001), and 10° T (

    =-0.30,

    =0.006). Multiple linear regression analysis indicated that the change in the central refraction was significantly correlated with the changes in the relative peripheral refraction at 20° N, 10° N, and 20°T (central refraction change=-0.42×20° N relative peripheral refraction change -0.22×10° N relative peripheral refraction change -0.25×20° T relative peripheral refraction change,where central refraction is the central refraction and relative peripheral refraction is the relative peripheral refraction;

    =0.47,

    =16.39,

    =0.0001). Multivariate logistic regression analysis indicated that the baseline central refraction [odds ratio (OR)=0.092, 95%CI: 0.012-0.688,

    =0.020)] and the baseline relative peripheral refraction at 10° N (OR=0.182,95%CI: 0.042-0.799,

    =0.024) were significantly correlated with incident myopia (Omnibus test,

    =10.20,

    =0.006).

    Differences Between Myopic and Non-myopic Students Among the myopic students, the central refraction and peripheral refraction at ±10° along the horizontal visual field changed significantly from the baseline to the follow-up examination (

    <0.01), while among the non-myopic students,the central refraction and peripheral refraction at 20° temporal visual field angle (denoted as 20° T) changed significantly from the baseline to the follow-up assessment (

    <0.01; Table 1).The relative peripheral refraction of the non-myopic students only changed significantly from the baseline to the follow-up at 20° T (

    <0.01), while that of the myopic students changed significantly at both ±20° and ±10° (

    <0.01). Moreover, the non-myopic students showed relative peripheral hyperopia at the 20° nasal visual field angle (denoted henceforth as 20° N;Table 2). Among students who became myopic, the peripheral refractions at 0° and ±10° were significantly more myopic than those of the non-myopic students, at both the baseline and during follow-up (

    <0.01; Figure 1A, 1B). The relative peripheral refraction at the baseline did not significantly differ between the myopic and non-myopic students (

    >0.05; Figure 1C), while that at ±20° and 10° N at the 2-year follow-up was significantly more hyperopic in the myopic students than in the non-myopic students (

    <0.05; Figure 1D).

    DISCUSSION

    The peripheral refraction at 0° and ±10° significantly differed between the myopic students and the three subgroups of nonmyopic students at both the baseline and follow-up (

    <0.01;Figure 2A, 2B). The baseline central refraction in the myopic and E0-E2 groups was significantly more myopic than that in the H0-E2 and H0-H2 groups (

    <0.05). At the 2-year followup, the peripheral refraction at 0° and ±10° was significantly lower in the myopic group than in the E0-E2, H0-E2, and H0-H2 groups (

    <0.01). No significant differences were found between the E0-E2 and H0-E2 groups at all visual field angles(

    >0.05).

    Our study showed that in all non-myopic eyes, the relative peripheral refraction only increased at 20° T in 2y, of which H0-H2 and E0-E2 subgroups had comparable variation in central refraction and a similar trend in relative peripheral refraction change. While H0-E2 group had comparable variation in central refraction and a similar trend of relative peripheral refraction change in 2y with myopic group. Our findings indicated that changes in relative peripheral refraction increased as the changes in central refraction increased, which was similar to the study by Atchison

    that significant differences in relative peripheral refraction were found between the H1-H2 and H1-E2 subgroups at follow-up, inferring that relative peripheral hyperopia also accompanied a decrease in central hyperopia. However, our study did not find a significant difference in relative peripheral refraction between the H0-H2 and H0-E2 subgroups, probably because of the small sample size, which is a limitation of this research, similar to previous reports

    .

    Our study also found that the relative peripheral refraction at 20° N showed the most obvious difference between eyes that became myopic and the eyes in the three non-myopic subgroups, which is similar to some other studies

    .And relative peripheral refraction at 20° N also increased remarkably and became relative hyperopia at the 2-year follow-up. It has been reported that the eyeball shape of myopic people tends to change to a long oval, while the eyeball shape in emmetropic people is generally spherical

    .MRI studies have shown that changes in peripheral refraction are related to the depth of the vitreous cavity and the shape of the posterior eyeball, and thus, peripheral refraction can be affected by changes in eye shape and retina shape, which have an important influence in the development and progression of myopia

    . The above studies might explain why peripheral refraction varied most at the more distant part of the peripheral retina rather than at the more central part of the peripheral retina, but the differences of nasal and temporal relative peripheral refraction change need further study.

    Recently, many clinical trials have shown that reverting the peripheral refraction to relative myopia by means of a multifocal soft contact lens or orthokeratology could retard the progression of myopia

    . However, to our knowledge,recent studies have found little evidence that baseline relative peripheral hyperopia is related to myopia onset and progression

    . Nevertheless, Mutti

    did show that the association between a more hyperopic RPR and the risk of myopia onset varied by ethnic group, and Asian children with more relative peripheral hyperopia had a higher risk of developing myopia. However, our study of Chinese children did not find that myopic eyes were more likely to have relative peripheral hyperopia at the baseline, which is similar to the findings of a study conducted on Chinese children by Atchison

    . Considering the higher risk of myopia onset and progression in Asian children, which has been established by many epidemiological research studies

    , we speculate that among children who go on to develop myopia, Asian children might have more relative peripheral hyperopia at the baseline (

    , before myopia onset) than children from some other ethnicities, such as African-American children and white children

    . Furthermore, our research found that more baseline relative peripheral hyperopia at 10° N was protective against myopia onset, which has not been mentioned in other studies. In our study, in univariate Logistic regression analysis, both baseline peripheral refraction and baseline central refraction at 10° N were significantly correlated with incidental myopia, and baseline relative peripheral hyperopia at 10° N was significantly correlated with baseline peripheral refraction at 10° N (data not shown), indicating that baseline relative peripheral hyperopia at 10° N may be an indicator of baseline central refraction, and may explain why baseline relative peripheral hyperopia at 10° N is significantly correlated with myopia onset. In the future, we will expand our sample size and further verify our conclusion by investigating the relationship between changes in the relative peripheral hyperopia and myopia onset and progression.

    當然以上都是后人對經(jīng)典中的人名或者名人姓名的漢譯,如果此人為當代人物,則漢譯用字無法做到長遠考慮,這應(yīng)該是當代外文人名漢譯幾乎純?yōu)橐糇g、缺失內(nèi)涵的重要原因。

    There are some concerns and limitations about our research.First, it has a small sample size. Second, there was no additional follow-up during the 2-year period, so further multicenter research with additional follow-up assessments is already being considered. Third, accommodation might also be a factor related to peripheral refraction

    , and the effects of accommodation of the peripheral retina on myopia onset and progression remain to be studied.

    Our results here are in line with those of other studies on peripheral refraction and reveal hyperopic changes in relative peripheral refraction in children who became myopic

    .Our findings suggested that relative peripheral hyperopia at 10° N may predict the occurrence of myopia in 14 to 16-yearold Chinese students, although the exact reason was unknown.

    ACKNOWLEDGEMENTS

    Supported by National Natural Science Foundation of China (No.81800854); Joint Innovation Project of National Defense Technology Innovation Zone (No.20-163-15-ZT-001-001-10); Efficiency Improvement Project of Air Force Medical University (No.2021HKYX24).

    Conflicts of Interest: Qi LS, None; Yao L, None; Wang XF,None; Zhao J, None; Liu Y, None; Wu TY, None; Yang QH,None; Zhao C, None; Zou ZK, None.

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    28 Hartwig A, Charman WN, Radhakrishnan H. Accommodative response to peripheral stimuli in myopes and emmetropes.

    2011;31(1):91-99.

    29 Gifford KL, Gifford P, Hendicott PL, Schmid KL. Stability of peripheral refraction changes in orthokeratology for myopia.

    2020;43(1):44-53.

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