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Photo of Saeideh Ghahghaei

Saeideh Ghahghaei

Research Associate

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  • Publications
  • Projects
Journal Articles
Higher Visual Function Deficits in Children With Cerebral Visual Impairment and Good Visual Acuity. (2021). Higher Visual Function Deficits in Children With Cerebral Visual Impairment and Good Visual Acuity. Frontiers In Human Neuroscience , 15. http://doi.org/10.3389/fnhum.2021.711873
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Predicting stereopsis in macular degeneration. (2020). Predicting stereopsis in macular degeneration. Journal Of Neuroscience. http://doi.org/10.1523/JNEUROSCI.0491-20.2020
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Calibration of the PlusOptix PowerRef 3 with change in viewing distance, adult age and refractive error. (2019). Calibration of the PlusOptix PowerRef 3 with change in viewing distance, adult age and refractive error. Ophthalmic And Physiological Optics, 39(4), 7.
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The upper disparity limit increases gradually with eccentricity. (2019). The upper disparity limit increases gradually with eccentricity. Journal Of Vision, 19(11).
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The effect of load on spatial attention depends on preview: Evidence from a reading study. (2018). The effect of load on spatial attention depends on preview: Evidence from a reading study. Vision Research.
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Texture segmentation influences the spatial profile of presaccadic attention. (2017). Texture segmentation influences the spatial profile of presaccadic attention. Journal Of Vision, 17(2).
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Accuracy of Eye Position for Saccades and Smooth Pursuit. (2016). Accuracy of Eye Position for Saccades and Smooth Pursuit. Journal Of Vision, 16(23). http://doi.org/10.1167/16.15.23
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Depth Perception and Grasp in Central Field Loss. (2016). Depth Perception and Grasp in Central Field Loss. Investigative Ophthalmology & Visual Science, 57, 1476-87.
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The crowding factor method applied to parafoveal vision. (2016). The crowding factor method applied to parafoveal vision. Journal Of Vision, 16(11), 7.
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Efficient saccade planning requires time and clear choices. (2015). Efficient saccade planning requires time and clear choices. Vision Research, 113, 125-36.
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Effects of load on the time course of attentional engagement, disengagement, and orienting in reading. (2013). Effects of load on the time course of attentional engagement, disengagement, and orienting in reading. Quarterly Journal Of Experimental Psychology, 66(3).
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Ghahghaei, S. Predicting Stereopsis in Macular Degeneration. Journal Of Neuroscience.
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Presentations/Posters
Scalable non-invasive pediatric cerebral visual impairment screening with the higher visual function question inventory (HVFQI). (2021). Scalable non-invasive pediatric cerebral visual impairment screening with the higher visual function question inventory (HVFQI). ACM-BCB.
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Characterization of Higher Visual Function Deficits (HVFDs) with a Question Inventory in children with Cerebral Visual Impairment (CVI) and good visual acuity (VA). (2021). Characterization of Higher Visual Function Deficits (HVFDs) with a Question Inventory in children with Cerebral Visual Impairment (CVI) and good visual acuity (VA). Date Published 05/2021, ARVO.
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The spectrum of reading difficulties in children with Cerebral Visual Impairment (CVI): a qualitative study. (2021). The spectrum of reading difficulties in children with Cerebral Visual Impairment (CVI): a qualitative study. Date Published 05/2021, ARVO.
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Assessment and management of cerebral visual impairment (CVI). . (2021). Assessment and management of cerebral visual impairment (CVI). . Date Published 04/2021, CTEBVI.
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CVI and the reading brain. (2019). CVI and the reading brain. Date Published 11/2019.
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Reading in mild to moderate traumatic brain injury (mTBI). (2019). Reading in mild to moderate traumatic brain injury (mTBI). Journal of Vision.
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Reading in mild to moderate traumatic brain injury (mTBI). (2019). Reading in mild to moderate traumatic brain injury (mTBI).
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Reading in mild to moderate traumatic brain injury (mTBI). (2018). Reading in mild to moderate traumatic brain injury (mTBI). Date Published 10/2018.
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Stereo perimetry reveals a foveal impairment of stereopsis in amblyopia. (2018). Stereo perimetry reveals a foveal impairment of stereopsis in amblyopia.
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Restoring Functional Stereopsis in AMD with Dichoptic Training. (2016). Restoring Functional Stereopsis in AMD with Dichoptic Training. Date Published 05/2016.
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SKERI-Optos: A Graphical User Interface to Map Scotoma and PRL with the Optos OCT/SLO. (2016). SKERI-Optos: A Graphical User Interface to Map Scotoma and PRL with the Optos OCT/SLO. Date Published 01/2016.
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Feedback about gaze position improves saccade efficiency. (2015). Feedback about gaze position improves saccade efficiency. Journal of vision.
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Immediate feedback improves saccadic efficiency. (2013). Immediate feedback improves saccadic efficiency. Journal of Vision. Association for Research in Vision and Ophthalmology.
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Orthographic familiarity of word N affects attentional disengagement from word N-1 in reading. (2012). Orthographic familiarity of word N affects attentional disengagement from word N-1 in reading. Date Published 01/2012.
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Other Publications
Method and Device for Improving Functional Stereopsis in Individuals with Central Vision Loss. (2018). Method and Device for Improving Functional Stereopsis in Individuals with Central Vision Loss. Date Published 01/2018.
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The dynamics of attention in active reading and effects of load. (2014). The dynamics of attention in active reading and effects of load. Date Published 01/2014, Goldsmiths, University of London.
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Active
Active

Investigating Reading in Individuals with Cerebral Visual Impairment (CVI)

In this project, we aim to understand (i) how CVI affects reading, (ii) how current rehabilitation techniques or assistive technologies help improve reading in CVI and (iii) what more can be done to assist those individuals with CVI

Active

Stereopsis in Macular Degeneration

Macular degeneration affects the central retina, often causing asymmetrical damage to the two eyes. How does this asymmetrical loss affect stereopsis — the percept of depth generated by the small separation of image features in the two eyes?

Active

Cerebral Visual Impairment (CVI): An in-depth study of visual functioning in everyday life

The purpose of this research study is to learn about how cerebral visual impairment affects everyday visually guided behaviours and determine interventions to treat the difficulties. This study is conducted remotely through telephone or video link and also in person at the laboratory.

Active

Reading in mTBI

People with mTBI often complain about dificulty in reading in spite of normal results in usual eye exams. We investigate this issue by looking at accommodation and reading rate and subjective measurement of reading difficuties for a variaty of reading tasks in normal and mTBI population. ...

Active

Adaptive Visual Strategies for Individuals with Macular Degeneration

In this project we try to gain a better understanding of what visual strategies people use to gather information in the world.

Active

Fovea Use During Smooth Pursuit

There is continuing debate as to whether smooth pursuit relies on the foveation of a moving target, especially when the target is compact. Previous studies have shown that gaze is placed on the center-of-mass of a target during saccadic eye movements. This research aims to understand whether eye...

Active

Eye Movements and Accommodation Patterns in Strabismus

Strabismus misaligned eyes is a common developmental condition in young children that can lead to amblyopia or poor vision and other forms of low vision. This project looks at the eye movements in relation to accommodation or focusing power in these patients to determine predictors of strabismus and outcome of treatment, with the goal of improving early detection, intervention and treatment.

Active

Eye-Hand coordination in Central Field Loss

Eye-hand coordination in AMD

Completed
Completed

The Window of Spatial Attention in Reading

We investigate the dynamics of spatial attention while the eyes move around to gather information.

Completed

Upper Depth Limit Across Visual Field

Stereopsis is important for tasks of daily living such as eye-hand coordination. It is best in central vision but is also mediated by the periphery. Previously we have shown that individuals with central-field loss who have residual stereopsis in the periphery perform better at an eye-hand-coordination task. Here we sought to determine what sets the limit of stereopsis, defined as the largest disparity that supports the sustained appearance of depth, in the near periphery in healthy individuals.

Completed

Calibration of Eccentric Power Refractor

Eccentric power refractors need to be calibrated for accommodation and gaze position for individual participants. Calibration however can be time consuming. We look at different conditions in which calibration is necessary or preferable. 

This project is now completed. Please see the...

Completed

Parafoveal Crowding

Crowding increases with eccentricity, and is most readily observed in the periphery. During natural, active vision however, central vision plays an important role. Measures of critical distance to estimate crowding are difficult in central vision, as these distances are small. Any overlap of...

Completed

SKERI-VF

Walker et al (Renninger, Psomadakis, Dang & Fletcher, 2008) suggested a novel method to estimate the monocular scotoma area from perimetry data in macular degeneration based on (i) an optic-disc based estimation of the location of the fovea and (ii) the increase in the receptive field size with eccentricity. Here, Dr Walker and I introduce a new GUI that applies this method to data from the Optos OCT/SLO.

Completed

Impact of Eye Movements on Reach Performance

Aim 2 of Reaching with Central Field Loss

Completed

Reaching with Central Field Loss

Parent R01

Completed

Strategies for Efficient Visual Information Gathering

Active visual search

Completed

Target Selection in the Real World

Attention and Segmentation

Mentors
  • Arvind Chandna
  • Suzanne McKee
  • James Coughlan

I am a cognitive psychologists and a vision scientist. I am interested in understanding reading problems in order to improve the reading experience. Along with Dr. Chandna, I study higher visual function deficits in children with cerebral visual impairment (CVI). Specifically, in collaboration with with Dr. Chandna I lead the research to investigate how CVI affects reading in each child in order to improve or develop individualized (re)habilitation techniques or assistive technologies. In addition, I am interested to understand how TBI (which is a form of CVI) affects reading in adults. I am also interested in binocular vision (stereopsis, fusion, suppression) and how the two eyes work together during daily living tasks in individuals with normal or abnormal vision, such as strabismus or amblyopia. To do so, I use (i) qualitative methods such as as in-depth interviews, surveys and questionnaires and (ii) quantitative methods such as regression, factor analysis and cluster analysis on objective data (e.g., eye-movements and accommodation measurements; behavioural data on psychophysics experiments or EEG). Furthermore, I develop applications that can be used for research or rehabilitation.

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