Vision Rehabilitation Lab

The main focus of this lab is to study visual functions (e.g. visual fields) and functional vision (e.g. visual search) in patients having visual impairment. Particular focus is given to children with special needs since majority of the usual clinical testing procedures lacks the ability to examine these children carefully. This leaves a huge gap in the clinical care of these children. Understanding the visual functions and functional vision in this population will result in effective therapy and rehabilitation.

Projects:

Development of Pediatric Perimeter:

A device to measure visual fields for infants and children with special needs has been built. On going studies are aimed towards collecting normative data, studying visual fields in children with special needs.


Development of Pediatric Perimeter:

In this project we are determining grating acuity by observing eye movements of children with special needs. A comparative testing is also made with the conventional test cards that are available.

Visual Search Studies:

Functional vision in patients can be assessed by testing their visual performance in several domains. One such domain is visual search. In these experiments reaction time and accuracy are the outcome measures to assess the performance. Eye tracking is also used to understand the eye movement characteristics (e.g. how long was the fixation made etc.) while performing these tasks.

The Team


Funding:

Department of Science & Technology (DST)- Fast Track grant; Wellcome Trust-DBT India Alliance for clinician to researcher grant (to Mr.Sourav Datta)

Collaborators:

The lab has active collaboration with other members of the Brien Holden Institute of Optometry and Vision Science group. International collaborators include Dr.Angela Brown, Ohio State University, Prof. Lea Hyvarinen, Finland, Prof. Eli Peli and Dr. Gang Luo, Schepens Eye Research Institute.


Scientific Publications


  1. Satgunam P, Datta S, Chillakala K, Bobbili KR, Joshi D (2017). Pediatric Perimeter a novel device to measure visual fields in infants and patients with special needs. Translational Vision Science and Technology. 6(3) doi:10.1167/tvst.6.4.3
  2. Satgunam P, Chindelevitch L (2017). Eyes on Bhopal, Three Decades Later: Vision screening results in a cohort of Bhopal gas disaster survivors. Current Science, 112 (10): 2085-2088.
  3. Bandela PK, Satgunam P, Garg P, Bharadwaj SR(2016). Corneal Transplantation in Disease Affecting Only One Eye: Does It Make a Difference to Habitual Binocular Viewing? PLoS ONE 11(3): e0150118. doi:10.1371/journal.pone.0150118
  4. Ambrogi N, Dias-Carlson R, Gantner K, Gururaj A, Hanumara N, Narain J, Winter A, Zielske I, Satgunam P, Bagga DK, Gothwal V (2015). Low vision system for rapid near- and far-field magnification switching.IEEE-Engineering in Medicine and Biology. DOI: 10.1109/EMBC.2015.7319517: 5012-5015.
  5. Peli E., Satgunam P (2014).Bitemporal hemianopia; its unique binocular complexities and a novel remedy. Ophthalmic and Physiological Optics. 34(2): 233-242.
  6. Satgunam P, Woods RL, Bronstad MP, Peli E. (2013). Factors affecting video quality preferences. IEEE Transactions on Image Processing, 22 (12): 5146- 5157.
  7. Kwon M, RamachandraC, SatgunamP, Mel BW, TjanBS (2012). Contour enhancement benefits older adults with simulated central field loss. Optometry and Vision Science, 89(9): 1374-1384.
  8. Satgunam P, Woods RL, Luo G, Bronstad MP, Reynolds Z, Ramachandra C, Mel BW, Peli E (2012). Effects of contour enhancement on low-vision preference and visual search. Optometry and Vision Science, 89(9): 1364-1373.
  9. Satgunam P, Peli E (2012). Torsional anomalous retinal Correspondence effectively expands the visual field in hemianopia. Optometry and Vision Science, 89(9):1353-1363.
  10. Satgunam P, Apfelbaum H, Peli E (2012). Volume Perimetry: measurement in depth of visual field loss. Optometry and Vision Science, 89(9):1265-1275.
  11. Luo G, Satgunam P, Peli E (2012). Visual search performance of patients with vision impairment: Effect of JPEG image enhancement. Ophthalmic and Physiological Optics. 32(5): 421-428.
  12. Woods RL, Satgunam P (2011). Television, computer and portable display device use by people with central vision impairment. Ophthalmic and Physiological Optics, 31: 258-274.
  13. Satgunam P, Woods RL, Bronstad MP, Peli E (2010). Factors affecting image quality preferences. SID Symposium Digest of Technical Papers, Digest 8.2,41(1): 94-97
  14. Woods RL, Satgunam P, Bronstad M, Peli E (2010). Statistical analysis of subjective preference for video enhancement. Proc. of SPIE-IS&T Electronic Imaging, SPIE Vol.7527, E1-10.
  15. Satgunam P, Gowrisankaran S, Fogt N (2009). The influence of vergence adaptation on open-loop vergence dynamics. Vision Research, 49: 1795-1804.
  16. Brown A, Lindsey D, Satgunam P, Miracle J (2007). Critical immaturities limiting infant binocular stereopsis. Investigative Ophthalmology and Visual Science, 48: 1424-1434.
  17. Satgunam P, Fogt N (2005). Saccadic latencies for achromatic and chromatic targets. Vision Research, 45: 3356-3364.


Funding:

Department of Science & Technology (DST)- Fast Track grant; Wellcome Trust-DBT India Alliance for clinician to researcher grant (to Mr.Sourav Datta)

Collaborators:

The lab has active collaboration with other members of the Brien Holden Institute of Optometry and Vision Science group. International collaborators include Dr.Angela Brown, Ohio State University, Prof. Lea Hyvarinen, Finland, Prof. Eli Peli and Dr. Gang Luo, Schepens Eye Research Institute.

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