The Effect of Environmental Illumination and Screen Brightness on Accommodation and Convergence

摘要

At present, a general belief is that viewing and 3-D images causes eye fatigue and discomfort because of the inconsistency between accommodation and convergence. However, our previous research found that both accommodation and convergence follow the position of virtual 3D objects synchronously. This was especially true in the case of young subjects aged in their 20s. In this study, we simultaneously measured variation of accommodation and convergence and their dependence on pupil diameter by changing the intensity of illumination as well as the brightness of the viewing screen. As a result, in the strongly lit environment, both accommodation and convergence nearly focused on the position of vertical objects. In a weakly lit environment, accommodation tends to focus on a position slightly father than that of convergence which is explained by the variation of pupil diameter.