A Comparison between Effect of Viewing Text on Computer Screen and iPad® on Visual Symptoms and Functions

Pittaya Phamonvaechavan


Objective: To compare the ocular symptoms following sustained near vision between laptop computer and iPad®.
Methods: Forty normal subjects read text from a laptop computer screen and an iPad® screen for a continuous 20 min period. Similar text was used in both sessions, which was matched for size and contrast. After finishing viewing text, subjects immediately completed a written questionnaire categorizing symptom scores into three groups: Dry eye, Pain and Blurred vision score. The accommodative amplitude and fusional convergence amplitude at near vision were also assessed before and after reading.
Results: In both conditions, mean symptom scores were higher during iPad use. When comparing the computer and iPad conditions, mean scores were statistically significant different in Pain score (6.30 vs 8.70; p=0.025) and Blurred vision score (10.13 vs 12.03; p=0.041) but no statistically significant difference in Dry eye score (6.30 vs 6.60; p=0.71). There were significant change in accommodative amplitude and fusional convergence amplitude with near vision when compared before and after near-vision tasks in both cases.
Conclusion: Pain and Blurred vision symptoms following sustained iPad use were significantly worse than those reported after computer use under similar viewing conditions. However, both computer screen and iPad cause ocular symptoms having an impact on quality of life.


Computer vision syndrome; iPad®; eyestrain

Full Text:


Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.


  • There are currently no refbacks.

Contact address:
Amornrat Sangkaew
Editorial Office Secretary
SiMR Bldg., 2nd Fl., Room No.207, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
Tel: +662 419 2884 | Fax: +662 411 0593 | Email: sijournal@mahidol.ac.th