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Many previous studies have suggested that hologram provides natural parallax and an accommodative response. However, objective/quantitative measurement of holographic performance and image quality, standardized standards and methods are still insufficient. In real life, humans continue to look at external objects in parallel with long distances and near distances. Depending on the distance looking at, natural visual activity is achieved through convergence and accomodation accordingly. Besides, blink rate, one of the major visual physiological reactions in humans, is a major visual function factor that directly affects ophthalmic diseases such as corneal inflammation and xerophthalmia. In this paper, we tried to find out the influence on human visual function when watching digital hologram produced from multi-view image data through factors such as accommodative response and blink rate. In the experiment, subjects of 30 people (29.54±3.71 years old) were selected and the accommodative response and blink rate were measured. The accommodative response was measured using N-vision 5001 at a distance of 40 cm and 50 cm, respectively. For the measurement of a hologram, the film was placed at 40 cm and the reconstruction distance was set up at 50 cm to measure the accommodative response to the hologram target. Blink rate was compared and analyzed through four environments (natural state, viewing monitor, viewing VR HMD, and viewing hologram). For data analysis, SPSS' one-way repeated measures analysis of variances was used. As a result of the experiment, there was no difference between the accommodative response of the hologram target (40 cm) and the accommodative response of the physical target (50 cm). In the blink rate, it was confirmed that the normal range of blink rate appeared in the hologram viewing environment. In this study, the safety of watching digital holograms from the perspective of visual function was verified.
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