The Investigation of the Prism Degree among the Normal Children Aged 4 - 6 Years Old in Laoshan District of Qingdao
Abstract: Objective: To investigate the prism value among the normal children aged 4 - 6 years old in Laoshan district of Qingdao and try to provide the normal distributions which may help to plan the strabismus surgery. Methods: 324 children of 2 kindergartens from Laoshan district were randomly sampled to determine if they were orthoptics, phoria, esotropia, concomitant extropia using light reflex test and cover-uncover test. The visual acuity and the ametropia of children were tested by the international standard visual acuity chart and the hand-held auto-refractomer separately. To compare the prism value among the different age teams, the data were analyzed by the paired-test, and the one-way ANOVA test. Results: There were 275 children in the normal team. Among the normal children, 15 children were orthoptic; 260 children (80.25%) were at near viewing phoria; 1 child was esophoria; the others were exophoria. However, only 20 children (6.17%) were distance phoria and they were all exophoria. The difference of prism value between the near viewing and distance viewing was significant in the normal team (P = 0.000). The prism value at near viewing was (−9.21 ± 5.31) PD; however, the value was (−0.31 ± 1.41) PD in distance. There was no difference among the different age teams. Conclusions: Among the normal 4 - 6 years old children, the prism value at near viewing was about −9 PD and the distance prism value was about 0 PD. Therefore, maybe 0 PD in the distance was the target of the strabismus surgery, especially to those who had more divergent degree at near viewing that did not reach the diagnosis of the insufficient divergent strabismus. Besides the binocular function, it was suggested to plan the surgery operation according to the prism value among the normal children aged 4 - 6 years old.
文章引用: 刘 冰 , 谢丽娟 , 韩秀敏 , 单若冰 (2015) 青岛市崂山区4~6岁正常儿童三棱镜度数的调查分析。 眼科学， 4， 78-82. doi: 10.12677/HJO.2015.44014
 李冰, 何媛媛, 关楠, 等. 沈阳市和平区7946名学龄前儿童斜视弱视调查[J]. 中国斜视与小儿眼科杂志, 2010, 18(2): 93-93.
 刘明华. 清远市区5011名学龄前儿童斜视弱视调查[J]. 中国妇幼保健, 2013, 28(21): 3478-3479.
 陈吉, 白静, 郁佳佳, 等. 学龄前儿童弱视与斜视1092例调查分析[J]. 中国儿童保健杂志, 2012(6): 530-532.
 林世斌, 黄育强, 马迪, 等. 汕头地区城乡中小学生斜视现况(2009~2010年)横断面研究[J]. 中国斜视与小儿眼科杂志, 2013(3): 8-10.
 金涵, 易敬林, 谢晖, 等. 学龄前儿童视觉发育状况调查研究[J]. 中华眼科杂志, 2011, 47(12): 1102-1106.
Lança, C., Serra, H. and Prista, J. (2014) Strabismus, Visual Acuity, and Uncorrected Refractive Error in Portuguese Children Aged 6 to 11 Years. Strabismus, 22, 115-119.
Babinsky, E., Sreenivasan, V. and Candy, T.R. (2015) Near Heterophoria in Early Childhood. Investigative Ophthalmology & Visual Science, 56, 1406-1415.
 Radaković, M., Ivetić, V., Naumović, N., et al. (2012) Heterophoria and Fusional Convergence and Divergence in Preschool Children. Medicinski Glasnik (Zenica), 9, 293-298.
Leone, J.F., Cornell, E., Morgan, I.G., et al. (2010) Prevalence of Heterophoria and Associations with Refractive Error, Heterotropia and Ethnicity in Australian School Children. British Journal of Ophthalmology, 94, 542-546.