Giving to CREOL CREOL, The College of Optics & Photonics

SID Student Chapter Seminar: "Polarization-sensitive scanning of the retina – from moving to no-moving part designs" by Dr. Boris Gramatikov

Friday, June 29, 2018 2:00 PM to 3:00 PM
CREOL Room 103

Dr. Boris Gramatikov


This talk is about utilizing the birefringent properties of the human fovea in the design of ophthalmologic diagnostic instrumentation. Our laboratory is developing novel technologies for Retinal Birefringence Scanning (RBS) - a technique that uses the changes in the polarization state of light returning from the fundus, to detect the projection into space of the radial array of birefringent Henle fibers surrounding the fovea. This allows eye tracking and detection of central fixation using anatomical information directly from the fovea and without calibration, in contrast to other eye tracking methods that employ less accurate pupillary light reflex methods. In a binocular setting, RBS allows precise checking for eye alignment, which is important in testing/screening for amblyopia (“lazy eye”), a major health problem.

The talk focuses on two major applications:  a) a family of pediatric vision screeners, and  b) a combined system where RBS technology is guiding the data acquisition and/or analysis in an Optical Coherence Tomography (OCT) system (in collaboration with Duke University). Both projects include design optimization using computer model of polarization-sensitive systems, incorporating Mueller matrix modeling and Poincare sphere representation. Special attention is paid to possible implementation of no-moving-part technologies, based on multiple sources of polarized light, liquid crystal technologies, and tunable filters (work in progress). Related topics will be discussed, such as automatic detection and correction of ocular defocus, laser safety, decision making logic, fixation attraction methods, and others.


Dr. Gramatikov is an assistant professor in the Division of Pediatric Ophthalmology and Adult Strabismus at the Wilmer Eye Institute. He is a biomedical engineer with expertise in medical instrumentation, electronic hardware, optoelectronics, medical optics, computer software, signal processing, computer modeling and data analysis. His current research interests are detection and retinal birefringence scanning in clinical settings. The main goal of his research is to identify and treat children with strabismus (misaligned eyes) or anisometropia (unequal refractive error) before irreversible amblyopia (functional monocular blindness) results. Dr. Gramatikov earned his Dipl.-Ing. (BS) degree from the Technical University of Ilmenau, Germany and his Ph.D. in biomedical engineering from the Technical University of Sofia's School of Electronic Engineering and Technology. He joined the Johns Hopkins faculty as a research associate in biomedical engineering in 1996 and was appointed to the Wilmer faculty in 2000.

For additional information:

Fangwang “Grace” Gou

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