Comparison of Accommodative System according to the Material and Font Size of Near Visual Media

Abstract

224 하나리, 김창진, 정수아, 최은정, 김현정 Comparison of Accommodative System according to the Material and Font Size of Near Visual Media Na-Ri Ha, Chang-Jin Kim, Su A Jung, Eun Jung Choi, and Hyun Jung Kim* Dept. of Optometry, Konyang University, Daejeon 302-718, Korea (Received April 24, 2014: Revised June 2, 2014: Accepted June 18, 2014) Purpose: This study was conducted to compare and analyze the accommodative system (accommodative response and accommodative lag) according to the material and font size of near visual media that we often encounter in daily life. Methods: Forty adult men and women aged 20 to 30 who not had specific ocular diseases and refractive surgery experience were examined to measure and compare the accommodative response according to the material of near visual media (print paper, newspaper, magazine, the I-Phone, LCD monitor) and font size (6, 8, 10, 12) by using both eyes open-view auto-refractometer. Results: The accommodative stimulus was 2.28±0.11 D and the accommodative response was 1.66±0.30 D. The accommodative lag namely the difference between accommodative stimulus and accommodative response was 0.62±0.28 D. The accommodative response according to material of visual media using LCD monitor was 1.35±0.26 D (p=0.00) and using the I-Phone was 1.55±0.25 D (p=0.04). Both of them were statistically significant lower. The accommodative lag using LCD monitor was 0.93 ±0.24 D (p=0.00) and using the I-Phone was 0.73±0.25 D (p=0.04) and they were statistically significant higher. The accommodative response and accommodative lag according to font size were not statistically significant (p>0.05). Conclusions: During near working, the accommodative system was more affected by material than font size of visual media. Especially, visual media of non-luminous material (print paper, newspaper, magazine) are considered fewer burdens on eyes than luminous material (I-Phone, LCD monitor) in terms of accommodative system.