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All Outputs (37)

Fitting Room: Lung Transplantation Donor-Recipient Size-matching in Virtual Reality (2024)
Presentation / Conference Contribution
Sibrina, D., Novysedlak, R., Kolarik, J., Lischke, R., & Koulieris, G. A. (2024, July). Fitting Room: Lung Transplantation Donor-Recipient Size-matching in Virtual Reality. Poster presented at SIGGRAPH '24: Special Interest Group on Computer Graphics and Interactive Techniques Conference, Denver CO USA

OrthopedVR: clinical assessment and pre-operative planning of paediatric patients with lower limb rotational abnormalities in virtual reality (2023)
Journal Article
Sibrina, D., Bethapudi, S., & Koulieris, G. A. (2023). OrthopedVR: clinical assessment and pre-operative planning of paediatric patients with lower limb rotational abnormalities in virtual reality. Visual Computer, 39, 3621–3633. https://doi.org/10.1007/s00371-023-02949-0

Rotational abnormalities in the lower limbs causing patellar mal-tracking negatively affect patients’ lives, particularly young patients (10–17 years old). Recent studies suggest that rotational abnormalities can increase degenerative effects on the... Read More about OrthopedVR: clinical assessment and pre-operative planning of paediatric patients with lower limb rotational abnormalities in virtual reality.

Effect of manipulating the vergence/accommodation and image size mismatches of the ±2D flipper test on the frequency and precision of accommodative facility (2023)
Journal Article
Vera, J., Redondo, B., Martínez‐Tovar, J. M., Molina, R., Koulieris, G. A., Allen, P. M., & Jiménez, R. (2023). Effect of manipulating the vergence/accommodation and image size mismatches of the ±2D flipper test on the frequency and precision of accommodative facility. Ophthalmic and Physiological Optics, 43(4), 660-667. https://doi.org/10.1111/opo.13136

Purpose
The ±2.00 D accommodative facility test presents several limitations, including the lack of objective information and inherent characteristics such as vergence/accommodative conflict, change in apparent size of the image, subjective criteria... Read More about Effect of manipulating the vergence/accommodation and image size mismatches of the ±2D flipper test on the frequency and precision of accommodative facility.

The Statistics of Eye Movements and Binocular Disparities during VR Gaming: Implications for Headset Design (2022)
Journal Article
Aizenman, A., Koulieris, G., Gibaldi, A., Sehgal, V., Levi, D., & Banks, M. S. (2023). The Statistics of Eye Movements and Binocular Disparities during VR Gaming: Implications for Headset Design. ACM Transactions on Graphics, 42(1), Article 7. https://doi.org/10.1145/3549529

The human visual system evolved in environments with statistical regularities. Binocular vision is adapted to these such that depth perception and eye movements are more precise, faster, and performed comfortably in environments consistent with the r... Read More about The Statistics of Eye Movements and Binocular Disparities during VR Gaming: Implications for Headset Design.

Effect of wearing different types of face masks during dynamic and isometric resistance training on intraocular pressure (2022)
Journal Article
Vera, J., Redondo, B., Koulieris, G., Jiménez, R., & García-Ramos, A. (2023). Effect of wearing different types of face masks during dynamic and isometric resistance training on intraocular pressure. Clinical and Experimental Optometry, 106(5), 503-508. https://doi.org/10.1080/08164622.2022.2054315

Clinical relevance: The use of face masks has demonstrated to be an effective strategy to prevent transmission of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). Wearing face masks, mainly Filtering Face Piece 2 (FFP2) masks, during exe... Read More about Effect of wearing different types of face masks during dynamic and isometric resistance training on intraocular pressure.

Dynamics of the accommodative response and facility with dual-focus soft contact lenses for myopia control (2021)
Journal Article
Vera, J., Redondo, B., Galan, T., Machado, P., Molina, R., Koulieris, G., & Jiménez, R. (2023). Dynamics of the accommodative response and facility with dual-focus soft contact lenses for myopia control. Contact Lens & Anterior Eye, 46(1), Article 101526. https://doi.org/10.1016/j.clae.2021.101526

Objective To assess the impact of using dual-focus soft contact lenses for myopia control on the dynamics of the accommodative response and facility. Methods 24 young adult myopes were fitted with dual-focus soft contact lenses for myopia control (Mi... Read More about Dynamics of the accommodative response and facility with dual-focus soft contact lenses for myopia control.

Examining the Validity of a New Method for the Objective Assessment of Binocular Accommodative Facility (2Q-AF Test): A Comparison with ± 2.00 DS Lens Flippers (2021)
Journal Article
Vera, J., Redondo, B., Koulieris, G., Molina, R., & Jiménez, R. (2022). Examining the Validity of a New Method for the Objective Assessment of Binocular Accommodative Facility (2Q-AF Test): A Comparison with ± 2.00 DS Lens Flippers. Current Eye Research, 47(1), 62-68. https://doi.org/10.1080/02713683.2021.1962359

Purpose: Recent technological advances have permitted to objectively record the accommodative response while shifting between two different levels of accommodation. This study is aimed at examining the concurrent validity of a new objective method fo... Read More about Examining the Validity of a New Method for the Objective Assessment of Binocular Accommodative Facility (2Q-AF Test): A Comparison with ± 2.00 DS Lens Flippers.

Short-term effects of caffeine intake on binocular accommodative facility: a quantitative and qualitative analysis (2021)
Journal Article
Redondo, B., Vera, J., Koulieris, G., Molina-Romero, R., & Jiménez, R. (2022). Short-term effects of caffeine intake on binocular accommodative facility: a quantitative and qualitative analysis. Clinical and Experimental Optometry, 105(5), 534-538. https://doi.org/10.1080/08164622.2021.1935218

Clinical relevance: Caffeine intake has been demonstrated to influence several physiological measures, including some related to eye physiology. The ability to focus at different distances is of paramount importance in real-world situations, and thus... Read More about Short-term effects of caffeine intake on binocular accommodative facility: a quantitative and qualitative analysis.

Eye Tracking Interaction on Unmodified Mobile VR Headsets Using the Selfie Camera (2021)
Journal Article
Drakopoulos, P., Koulieris, G., & Mania, K. (2021). Eye Tracking Interaction on Unmodified Mobile VR Headsets Using the Selfie Camera. ACM Transactions on Applied Perception, 18(3), 1-20. https://doi.org/10.1145/3456875

Input methods for interaction in smartphone-based virtual and mixed reality (VR/MR) are currently based on uncomfortable head tracking controlling a pointer on the screen. User fixations are a fast and natural input method for VR/MR interaction. Prev... Read More about Eye Tracking Interaction on Unmodified Mobile VR Headsets Using the Selfie Camera.

Intraocular Pressure Responses to Four Different Isometric Exercises in Men and Women (2020)
Journal Article
Vera, J., Redondo, B., Koulieris, G., Torrejon, A., Jiménez, R., & Garcia-Ramos, A. (2020). Intraocular Pressure Responses to Four Different Isometric Exercises in Men and Women. Optometry and Vision Science, 97(8), 648-653. https://doi.org/10.1097/opx.0000000000001545

SIGNIFICANCE: The performance of resistance exercise has evidenced to induce abrupt intraocular pressure (IOP) changes, which has been linked to the onset and progression of glaucoma. We found that four different isometric resistance exercises lead t... Read More about Intraocular Pressure Responses to Four Different Isometric Exercises in Men and Women.

The intraocular pressure response to lower-body and upper-body isometric exercises is affected by the breathing pattern (2020)
Journal Article
Vera, J., Redondo, B., Perez-Castilla, A., Koulieris, G., Jiménez, R., & Garcia-Ramos, A. (2021). The intraocular pressure response to lower-body and upper-body isometric exercises is affected by the breathing pattern. European Journal of Sport Science, 21(6), 879-886. https://doi.org/10.1080/17461391.2020.1790670

We assessed the mediating role of the breathing pattern adopted during isometric exercise on the intraocular pressure (IOP) response in the back squat and biceps curl exercises. Twenty physically active young adults performed sets of 1-minute isometr... Read More about The intraocular pressure response to lower-body and upper-body isometric exercises is affected by the breathing pattern.

DiCE: Dichoptic Contrast Enhancement for VR and Stereo Displays (2019)
Journal Article
Zhong, F., Koulieris, G., Drettakis, G., Banks, M. S., Chambe, M., Durand, F., & Mantiuk, R. (2019). DiCE: Dichoptic Contrast Enhancement for VR and Stereo Displays. ACM Transactions on Graphics, 38(6), Article 211. https://doi.org/10.1145/3355089.3356552

In stereoscopic displays, such as those used in VR/AR headsets, our eyes are presented with two different views. The disparity between the views is typically used to convey depth cues, but it could be also used to enhance image appearance. We devise... Read More about DiCE: Dichoptic Contrast Enhancement for VR and Stereo Displays.

Validation of an Objective Method for the Qualitative and Quantitative Assessment of Binocular Accommodative Facility (2019)
Journal Article
Vera, J., Redondo, B., Molina, R., Koulieris, G., & Jiménez, R. (2020). Validation of an Objective Method for the Qualitative and Quantitative Assessment of Binocular Accommodative Facility. Current Eye Research, 45(5), 636-644. https://doi.org/10.1080/02713683.2019.1688837

Purpose: Assessing binocular accommodative facility (BAF) enables the evaluation of the interaction between the accommodative and vergence systems, which is relevant for the diagnosis of accommodative and binocular disorders. However, the tests used... Read More about Validation of an Objective Method for the Qualitative and Quantitative Assessment of Binocular Accommodative Facility.

Acute intraocular pressure changes during isometric exercise and recovery: The influence of exercise type and intensity, and participant´s sex (2019)
Journal Article
Vera, J., Raimundo, J., García-Durán, B., Pérez-Castilla, A., Redondo, B., Delgado, G., …García-Ramos, A. (2019). Acute intraocular pressure changes during isometric exercise and recovery: The influence of exercise type and intensity, and participant´s sex. Journal of Sports Sciences, 37(19), 2213-2219. https://doi.org/10.1080/02640414.2019.1626072

We assessed the intraocular pressure (IOP) behaviour during a 1-minute period of isometric physical effort and the immediate 1-minute of recovery in the mid-thigh clean pull and squat exercises at three different intensities. Twenty physically active... Read More about Acute intraocular pressure changes during isometric exercise and recovery: The influence of exercise type and intensity, and participant´s sex.

Near‐Eye Display and Tracking Technologies for Virtual and Augmented Reality (2019)
Journal Article
Koulieris, G., Aksit, K., Stengel, M., Mantiuk, R., Mania, K., & Richardt, C. (2019). Near‐Eye Display and Tracking Technologies for Virtual and Augmented Reality. Computer Graphics Forum, 38(2), 493-519. https://doi.org/10.1111/cgf.13654

Virtual and augmented reality (VR/AR) are expected to revolutionise entertainment, healthcare, communication and the manufacturing industries among many others. Near-eye displays are an enabling vessel for VR/AR applications, which have to tackle man... Read More about Near‐Eye Display and Tracking Technologies for Virtual and Augmented Reality.

Investigating the Immediate and Cumulative Effects of Isometric Squat Exercise for Different Weight Loads on Intraocular Pressure: A Pilot Study (2019)
Journal Article
Vera, J., Jiménez, R., Redondo, B., Torrejón, A., Koulieris, G. A., Gustavo de Moraes, C., & García-Ramos, A. (2019). Investigating the Immediate and Cumulative Effects of Isometric Squat Exercise for Different Weight Loads on Intraocular Pressure: A Pilot Study. Sports Health, 11(3), 247-253. https://doi.org/10.1177/1941738119834985

Background: The execution of resistance exercise against heavy loads promotes an acute intraocular pressure (IOP) rise, which has detrimental effects on ocular health. However, the effect of load on the IOP behavior during exercise remains unknown du... Read More about Investigating the Immediate and Cumulative Effects of Isometric Squat Exercise for Different Weight Loads on Intraocular Pressure: A Pilot Study.

Accommodation and comfort in head-mounted displays (2017)
Journal Article
Koulieris, G., Bui, B., Banks, M. S., & Drettakis, G. (2017). Accommodation and comfort in head-mounted displays. ACM Transactions on Graphics, 36(4), Article 87. https://doi.org/10.1145/3072959.3073622

Head-mounted displays (HMDs) often cause discomfort and even nausea. Improving comfort is therefore one of the most significant challenges for the design of such systems. In this paper, we evaluate the effect of different HMD display configurations o... Read More about Accommodation and comfort in head-mounted displays.

An Automated High-Level Saliency Predictor for Smart Game Balancing (2014)
Journal Article
Koulieris, G. A., Drettakis, G., Cunningham, D., & Mania, K. (2015). An Automated High-Level Saliency Predictor for Smart Game Balancing. ACM Transactions on Applied Perception, 11(4), Article 17. https://doi.org/10.1145/2637479

Successfully predicting visual attention can significantly improve many aspects of computer graphics: scene design, interactivity and rendering. Most previous attention models are mainly based on low-level image features, and fail to take into accoun... Read More about An Automated High-Level Saliency Predictor for Smart Game Balancing.

C-LOD: Context-aware Material Level-of-Detail applied to Mobile Graphics (2014)
Journal Article
Koulieris, G. A., Drettakis, G., Cunningham, D., & Mania, K. (2014). C-LOD: Context-aware Material Level-of-Detail applied to Mobile Graphics. Computer Graphics Forum, 33(4), 41-49. https://doi.org/10.1111/cgf.12411

Attention‐based Level‐Of–Detail (LOD) managers downgrade the quality of areas that are expected to go unnoticed by an observer to economize on computational resources. The perceptibility of lowered visual fidelity is determined by the accuracy of the... Read More about C-LOD: Context-aware Material Level-of-Detail applied to Mobile Graphics.