The effect of room light intensity on ocular accommodation

• Main Authors: Shou-Jen Chin, 金守仁
• Other Authors: Cheng-Lun Tsai
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/20389993422423649286

碩士 === 中原大學 === 生物醫學工程研究所 === 100 === Abstract The purpose of this study is to evaluate the effect of room light intensity on ocular accommodation and to assess if the effect is one of causes to worsen myopia. A total of 56 subjects (105 eyes) 21 to 27 years of age with myopia (Spherical Equivalents<-0.2 D) performed autorefraction examination to obtain refraction (defined as spherical equivalent [SE]), pupil size and near-point distance, far-point distance of vision(defined as ocular accommodation) under low, medium and high level room light intensity settings: 600, 1200 &; 1800 lux, respectively. The results show that the subjects’ ocular accommodation is better in high light intensity than that in low light intensity (p<0.01). Note that this is in the range of 2.1 D. The main difference between the high light intensity and the low light intensity is near-point distance of vision, which 1.12 cm short (p<0.01) was noted. Both myopia and pupil size were lowly positive correlated with ocular accommodation (The Pearson correlation coefficients were less than 0.14). In conclusion, high light intensity definitely facilitates the ocular accommodation. However, this may not be advantageous. When one’s ocular accommodation is better, he tends adjust it to see subjects. The consequence in the long run is that the near-point distance of vision becomes shorter and thus it likely causes myopia aggravation. These findings suggest that the use of high light intensity setting should be cautious to prevent myopia from getting worse.