Dr. Tatjana Pladere Profile

Dr. Tatjana Pladere

Researcher at Univ of Latvia

SPIE Involvement:

Author | Career Lab Leader | Leadership Workshop Facilitator | Career Lab Editorial Board

Publications (3)

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Proceedings Article | 16 March 2023 Poster + Paper

Impact of interpupillary distance mismatch on visual aftereffects of virtual reality gameplay

Reicela Livitcuka, Reinis Alksnis, Tatjana Pladere

Proceedings Volume 12449, 1244925 (2023) https://doi.org/10.1117/12.2666238

KEYWORDS: Virtual reality, Visualization, Visual system, Optometry

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In stereoscopic extended reality headsets, the distance between optical systems composed of a pair of displays and lenses can be fixed or adjustable. A mismatch between interpupillary distance (IPD) and the distance between optical systems may cause user discomfort and distortions in spatial perception. Nevertheless, little is known about its potential effect on vergence and accommodation. In the study, we explored how visual parameters changed after using the virtual reality headset with a fixed distance between optical systems using routine eye examination tests. Sixty-two subjects (18-33 years of age) were divided into two groups based on the IPD mismatch: 0-5 mm (n = 29) and 6-10 mm (n = 33). Their visual parameters including near point of convergence, amplitude of accommodation, binocular accommodative facility, near horizontal phoria, and fusional reserves were assessed before and after playing 30 minutes of the virtual reality mini-golf game. The data showed considerable changes in the amplitude of accommodation and near point of convergence after the use of virtual reality. Moreover, the prevalence of adverse changes in accommodation and vergence was higher when IPD was mismatched by 6-10 mm compared with the smaller off-alignment. Overall, the findings suggest that the distance between the optical systems in the headsets should be adjustable and matched with the distance between the user’s eyes to lower the demands on the visual system. Moreover, the contribution of IPD mismatch needs to be considered in the user studies investigating the impact of stereoscopic extended reality on the visual system.

Proceedings Article | 14 March 2023 Poster + Paper

Prevalence of oculomotor changes following the near work in stereoscopic augmented reality

Kristiana Zizlane, Reinis Alksnis, Tatjana Pladere

Proceedings Volume 12443, 124430J (2023) https://doi.org/10.1117/12.2668376

KEYWORDS: Visualization, Augmented reality, Displays, Visual system, Near eye displays, Optometry

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Extended reality human factors studies commonly utilize an approach in which group behavior is reported. This possibly masks the true prevalence of oculomotor changes that appear in response to stereoscopic augmented reality. Thus, the study aimed to elucidate the prevalence, direction, and magnitude of oculomotor changes after the near work in stereoscopic augmented reality. The task of fifty-three subjects (18-28 years old, normal visual acuity, no vision complaints) was to type the text displayed at 60 cm as accurately and quickly as possible. Each subject participated in two sessions – the text was displayed in stereoscopic augmented reality and on the computer screen. Clinical assessments of visual parameters were performed before and immediately after 30 minutes of the task. As a result, individual variations were found in the magnitude and direction of oculomotor changes after the near work. After the use of stereoscopic augmented reality, adverse changes in vergence and accommodation were observed in about 40% of the group. Despite the prevalence of adverse oculomotor changes being similar in the case of text displayed on the computer screen, only less than 20% of the group showed a decline of visual parameters in both viewing conditions. The exploratory study highlights the necessity to consider individual variations in visual responses and identify groups that might benefit or be disadvantaged in using stereoscopic augmented reality technologies.

Proceedings Article | 28 March 2021 Presentation + Paper

Binocular function measures as predictors of user performance in stereoscopic augmented reality

Tatjana Pladere, Artis Luguzis, Roberts Zabels, Rendijs Smukulis, Viktorija Barkovska, Linda Krauze, Vita Konosonoka, Aiga Svede, Gunta Krumina

Proceedings Volume 11765, 117650T (2021) https://doi.org/10.1117/12.2591934

KEYWORDS: Augmented reality, Visualization, Tolerancing, Visual system, Head-mounted displays

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Inconsistency between the binocular and focus cues in stereoscopic augmented reality overburdens the visual system leading to its stress. However, a high individual variability of tolerance for visual stress makes it difficult to predict and generalize the user gain associated with the implementation of alternative visualization technologies. In this study, we investigated the relationship between the binocular function and perceptual judgments in augmented reality. We assessed the task completion time and accuracy of perceptual distance matching depending on the consistency of binocular and focus cues in the stereoscopic environment of augmented reality. The head-mounted display was driven in two modes: multifocal and monofocal mode, providing consistent-cues and inconsistent-cues condition, respectively. Participants matched the distance of a real object with images displayed at three viewing distances (concordant with distances of display focal planes in the consistent-cues condition). A thorough vision screening was performed before the experiment. As a result, individuals with low convergent fusional reserves and receded near point of convergence misjudged distances to a higher extent in comparison to others in the inconsistent-cues condition. In contrast, perceptual judgments were fast and less overestimated, as well as no significant effect of binocular function was revealed in the consistent-cues condition. We suggest that the binocular function measures characterizing individual tolerance for visual stress might be used as the predictors of user gain in the comparative assessment of new visualization technologies for the augmentation of reality.

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