B I Gramatikov
Affiliation: Johns Hopkins University
- Detecting fixation on a target using time-frequency distributions of a retinal birefringence scanning signalBoris Gramatikov
Laboratory of Ophthalmic Optics, Krieger Children s Eye Center, Pediatric Ophthalmology and Adult Strabismus, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, RM, 233, 600 N, Wolfe St, Baltimore, Maryland, USA
Biomed Eng Online 12:41. 2013..With very young patients who are not cooperative enough, this presents a problem, because central fixation may be present only during very short-lasting episodes, and can easily be missed by the FFT...
- Birefringence-based eye fixation monitor with no moving partsB I Gramatikov
Johns Hopkins University School of Medicine, Wilmer Ophthalmological Institute, The Krieger Children s Eye Center, Baltimore, Maryland 21287 9028, USA
J Biomed Opt 11:34025. 2006..The algorithm is tested on a computer model, and the apparatus is tested on human subjects. This work demonstrates the feasibility of a fixation monitor with no moving parts...
- Directional eye fixation sensor using birefringence-based foveal detectionBoris I Gramatikov
Krieger Children s Eye Center at The Wilmer Institute, The Johns Hopkins University School of Medicine, MD 21287 9028, USA
Appl Opt 46:1809-18. 2007..The major advantage of this new eye-tracking method is that it uses true information coming from the fovea, rather than reflections from other structures, to identify the direction of foveal gaze...
- Automated detection of ocular focusDavid G Hunter
Children s Hospital Boston, Department of Ophthalmology, 300 Longwood Avenue, Boston, Massachusetts 02115, USA
J Biomed Opt 9:1103-9. 2004..A device that can assess focus rapidly and objectively will make it possible to perform low-cost, mass screening for focusing problems such as may exist in children at risk for amblyopia...
- Pediatric Vision Screener 1: instrument design and operationDavid G Hunter
Harvard Medical School, Children s Hospital Boston, Department of Ophthalmology, 300 Longwood Avenue, Boston, Massachusetts 02115, USA
J Biomed Opt 9:1363-8. 2004..With objective, automated measurement of both alignment and focus, the PVS represents a new approach to screening children for treatable eye disease such as amblyopia...
- Pediatric Vision Screener 2: pilot study in adultsDeborah S Nassif
Harvard Medical School, Children's Hospital Boston, Department of Ophthalmology, 300 Longwood Avenue, Boston, Massachusetts 02115, USA
J Biomed Opt 9:1369-74. 2004..The PVS shows high sensitivity and specificity for detection of strabismus in adults. Future studies will determine whether this performance can be achieved in preschool children, who are at greatest risk for vision loss...
- Use of retinal nerve fiber layer birefringence as an addition to absorption in retinal scanning for biometric purposesMikael Agopov
Kirchhoff Institut für Physik, University of Heidelberg, INF 227, 69120 Heidelberg, Germany
Appl Opt 47:1048-53. 2008..The birefringence-derived signal proved to add useful information to the reflectance-absorption signature for retinal biometric scanning...