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AIM: To investigate the differences of myopia and ocular biological parameters of primary and middle school students in Urumqi.METHODS: A cross-sectional survey. A total of 2 495 primary and middle school students aged 7 to 18 from 4 schools in Urumqi were selected by judgemental sampling from September 2021 to November 2021 for relevant eye examination. The differences of ocular biological parameters and refractive status of students of different ages, genders and nationalities were compared, and the correlation between spherical equivalent(SE)and ocular biological parameters was analyzed.RESULTS: The detection rate of poor vision among the students was 80.36%, the detection rate of myopia was 55.91%, and the detection rate of astigmatism was 42.96%, among which the detection rate of low myopia was 63.80%, the detection rate of moderate myopia was 27.60%, and the detection rate of high myopia was 8.60%. There were significant differences in the detection rate of poor vision, myopia, astigmatism, SE and some ocular biological parameters among students of different ages and nationalities(all P<0.05). Among them, the detection rate of myopia, astigmatism and poor vision among Uygur and Kazakh ethnic groups was significantly lower than that of Han. The detection rate of poor vision and myopia among boys was lower than that among girls, while the detection rate of astigmatism was higher than that of girls. Spearman correlation analysis showed that axis length of eye, axial length to axial ratio, anterior chamber depth, and pupil diameter were negatively correlated with SE(rs=-0.664, -0.724, -0.320, -0.086, all P<0.001), and lens thickness was positively correlated with SE(rs=0.147, P<0.001).CONCLUSION: The prevalence of myopia among primary and secondary school students in Urumqi is high, and there are differences in the distribution of ocular biological parameters among children and adolescents of different ages and ethnicities.
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AIM:To investigate the effect of orthokeratology on stereopsis, accommodation parameters and ocular biological parameters in myopic patients. METHODS: The clinical data of 65 patients (130 eyes) with myopia in our hospital from January 2016 to May 2017 were analyzed and they were divided into high myopia group,moderate myopia group and slight myopia group. The changes of stereopsis, accommodation parameters and ocular biological parameters were compared between the myopic patients before and after the operation. RESULTS: The difference of distant vision, stereo acuity, accommodation range and accommodation sensitivity between the three groups were statistically significant (P<0.05). The uncorrected visual acuity, the degree of spherical equivalent and the diopter of cylindrical power in the myopic eyes were significantly lower than those before treatment,and the difference was statistically significant (P<0.05). The intraocular pressure and central corneal thickness were not different compared with before treatment (P>0. 05). After treatment, the corneal curvature was lower and axial length were higher than those before treatment, the difference was statistically significant (P<0.05). CONCLUSION: Orthokeratology can obviously improve the distance and near vision and stereoscopic vision function of myopic patients,which may slow the increase of axis and reduce the corneal curvature.
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@#AIM:To investigate the influences of Nd:YAG laser capsulotomy with different size on visual acuity(VA), intraocular pressure(IOP), refraction, anterior chamber depth(ACD), and macular thickness(MT)in patients with posterior capsular opacification(PCO). <p>METHODS: In this retrospective, constantly study, 41 eyes of 41 patients treated with Nd:YAG laser posterior capsulotomy for PCO were divided into 2 groups according to the different incision sizes of capsulotomy: the patients received capsulotomy with the incision diameter less than or equal to 3.5mm were enrolled into group 1, while those received operation with incision diameter more than 3.5mm went to group 2. All patients were followed up before Nd:YAG laser capsulotomy, 1wk, 1 and 3mo after Nd:YAG laser capsulotomy, and the best-corrected visual acuity(BCVA), refraction, IOP, ACD, and MT were compared between two groups. <p>RESULTS: In both groups, BCVA were significantly improved postoperatively compared with base line(<i>P</i><0.001), but there was no significant difference between two groups(<i>P</i>>0.05). The diopter(SE)of the two groups were not significantly different before and after operation(<i>P</i>>0.05). Intraocular pressure in group 2 was higher than those in group1 at 1wk(<i>t</i>=-2.609, <i>P</i>=0.013). ACD decreased significantly at 1wk postoperatively(<i>P</i><0.01), but with no significant difference at 1 and 3mo(<i>P</i>>0.05). Both groups had increased macular thickness lightly at 1wk postoperatively, but with no statistical significance(<i>P</i>>0.05), and there was no significant difference between the two groups at 1wk, 1 and 3mo postoperatively(<i>P</i>>0.05). <p>CONCLUSION: The increase in intraocular pressure is more pronounced when the size of posterior capsulotomy was larger. However, the changes of BCVA, ACD, refraction, MT are not related with the incision size of posterior capsulotomy.