TY - JOUR
T1 - A no-moving-parts sensor for the detection of eye fixation using polarised light and retinal birefringence information
AU - Gramatikov, Boris I.
AU - Guyton, David L.
N1 - Publisher Copyright:
© 2017 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2017/5/19
Y1 - 2017/5/19
N2 - Polarised near-infra-red light is reflected from the foveal area in a detectable bow-tie pattern of polarisation states, offering the opportunity for eye tracking. A coaxial optical transducer was developed, consisting of a laser diode, a polariser, a filter, and a photodetector. Several such transducers may be used to interrogate different spots on the retina, thus eliminating the requirement for scanning systems with moving parts. To test the signal quality obtainable, using just one transducer, a test subject was asked to fixate successively on twelve targets located on a circle around the transducer, to simulate the retina’s being interrogated by twelve sensors placed on a 30 diameter circle surrounding the projection of the fovea. The resulting signal is close to the “ideal” sine wave that would have been recorded from a propeller-type birefringence pattern from a human fovea. The transducer can be used in the detection of fixation for medical and other purposes. It does not require calibration, strict restrictions on head position, or head-mounted appliances.
AB - Polarised near-infra-red light is reflected from the foveal area in a detectable bow-tie pattern of polarisation states, offering the opportunity for eye tracking. A coaxial optical transducer was developed, consisting of a laser diode, a polariser, a filter, and a photodetector. Several such transducers may be used to interrogate different spots on the retina, thus eliminating the requirement for scanning systems with moving parts. To test the signal quality obtainable, using just one transducer, a test subject was asked to fixate successively on twelve targets located on a circle around the transducer, to simulate the retina’s being interrogated by twelve sensors placed on a 30 diameter circle surrounding the projection of the fovea. The resulting signal is close to the “ideal” sine wave that would have been recorded from a propeller-type birefringence pattern from a human fovea. The transducer can be used in the detection of fixation for medical and other purposes. It does not require calibration, strict restrictions on head position, or head-mounted appliances.
KW - Eye fixation
KW - eye tracking
KW - retinal birefringence sensor
KW - retinal scanning
UR - http://www.scopus.com/inward/record.url?scp=85010691025&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85010691025&partnerID=8YFLogxK
U2 - 10.1080/03091902.2017.1281357
DO - 10.1080/03091902.2017.1281357
M3 - Article
C2 - 28122478
AN - SCOPUS:85010691025
SN - 0309-1902
VL - 41
SP - 249
EP - 256
JO - Journal of Medical Engineering and Technology
JF - Journal of Medical Engineering and Technology
IS - 4
ER -