The Influence On The Refractive State For Children After Near Work By Different Ways

Objective To study the changes in the refractive state(vision、refraction、corneal curvature 、 intraocular pressure and blink times) of the children after they used different ways of near work for a short time to explore the impact of different ways of near work on children’s eye refractive state.Methods Twenty children(40 eyes) aged 5to7 years,of whom the uncorrected visual acuity≧0.8、diopter range within ± 0.75 D,were enrolled in the study.The binocular vision、refractive、corneal curvature、IOP and blink times were Measured before the test, then repeat the above measurement indicators after continuous use of computer 30 min. immediately. The observation targets were Measured after using the other ways(Ipad 、 phone and picture book)during different times at 3 days intervals.And the results are analyzed statistically.Results1.The Comparison of the refractive indexes before and after different near work ways After using computer, ipad, phone, picture book for 30 minutes: The average visual and corneal curvature compared with the previous had no dominant variation(P>0.05).the average refraction compared with previous direction to myopia,after using computer and phone the change was statistically significant(P <0.01),after using ipad and picture books the change was not statistically significant(P> 0.05);the average IOP compared with previous increased,except for using ipad, the rest of the way IOP were significantly increased(P <0.01); the rage number of instantaneous directory were reduced significantly, there is a significant difference(P <0.01)compared with that before the test.The average number of eye blink rate,compared with the previous decreased significantly(P<0.01).2.The impact of the different ways of near wok on refractive factors. After using different near work ways:There are significant differences on the impact of refraction and blink times(P<0.05),on the impact of IOP and corneal curvature,there was no significant difference.(P>0.05).3.Pearson correlation analysis showed:No significant correlation between changes in IOP and refraction after different ways of near work.Conclusions After using computer、ipad、phone、picture book for 30 minutes can produce the following effects:1.there are no significant effect on visual and corneal curvature.2.All of them can cause temporary myopia changes, the affect after using computer and phone was significant. There were significant differences in the impact on Children’s refraction by different ways of near work.3. All of them can cause IOP increased, in addition to ipad, with the other way around eye on intraocular pressure were significantly different. Different ways of near work were no significant difference in the effect on IOP.4.No significant correlation between the changes in IOP and refraction after different ways of near work.