中老年移动端数字阅读最小可辨识字号研究

Minimum Legible Font Size of Digital Reading for the Middle-Aged and Elderly Users

目的 研究移动端数字阅读场景下,中老年用户对不同颜色字体的最小可辨识字号,为移动应用的适老化设计升级提供参照标准。方法 通过实验法,分析主流资讯类APP中4种典型灰度颜色——弱黑(1F1F1F)、深灰(525252)、灰色(858585)、浅灰(B8B8B8)能够让95%以上50~70岁中老年用户辨识的最小字号。结果 对于中老年用户,弱黑、深灰、灰色、浅灰在移动端数字阅读时的最小可辨识字号分别为7.17 pt、7.17 pt、8.19 pt、9.21 pt,浅灰色字辨识难度显著高于其他3种颜色。结论 设计及开发人员应慎重在中老年移动互联网应用中使用浅灰及更淡的颜色。易读的弱黑、深灰色的最小可辨识字号均为7.17 pt,该值可作为移动端数字阅读辅助信息场景(如系统设置、功能按钮、标签)的最小字号阈值。

By studying the minimum legible font size of different colors for middle-aged and elderly users in mobile digital reading,this research aims to provide a reference standard for the age-appropriate design of mobile applications.Through experiments,this research analyzes the minimum legible font size in the four typical gray-scale colors in main-stream information apps—weak black(1F1F1F),dark gray(525252),gray(858585),and light gray(B8B8B8)respec-tively when 95%or more middle-aged and elderly users aged 50-70 can identify.For middle-aged and elderly users,the minimum legible font sizes for weak black,dark gray,gray,and light gray in digital reading on the mobile devices are 7.17 pt,7.17 pt,8.19 pt,9.21 pt respectively,among which the light gray font is significantly more difficult to recognize compared to the other three colors.Designers and developers should be cautious in using light gray and other lighter col-ors in mobile applications for middle-aged and elderly users.The minimum legible font size of weak black and dark gray are both 7.17 pt,which can be set as the minimum font size threshold for the auxiliary information in mobile digital read-ing(such as system settings,function buttons and labels).