Improved fixation quality provided by a Bessel beacon in an adaptive optics system

Purpose We investigate whether a structured probe beam that creates the beacon for use in a retinal imaging adaptive optics system can provide useful side effects. In particular we investigate whether a Bessel beam that is seen by the subject as a set of concentric rings has a dampening effect on fi...

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Bibliographic Details
Published in:Ophthalmic & physiological optics 2013-07, Vol.33 (4), p.403-411
Main Authors: Lambert, Andrew J, Daly, Elizabeth M, Dainty, Christopher J
Format: Article
Language:English
Subjects:
adaptive optics
Adult
Bessel beam
fixation
Fixation, Ocular - physiology
Humans
Middle Aged
Models, Anatomic
Ophthalmoscopy - methods
Optics and Photonics - methods
Retina - anatomy & histology
retinal imaging
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Summary:Purpose We investigate whether a structured probe beam that creates the beacon for use in a retinal imaging adaptive optics system can provide useful side effects. In particular we investigate whether a Bessel beam that is seen by the subject as a set of concentric rings has a dampening effect on fixation variations of the subject under observation. This calming effect would allow longer periods of observation, particularly for patients with abnormal fixation. Method An experimental adaptive optics system developed for retinal imaging is used to monitor the fluctuations in aberrations for artificial and human subjects. The probe beam is alternated between a traditional beacon and one provided by a Bessel beam created by SLM. Results Time‐frequency analysis is used to indicate the differences in power and time variation during fixation depending on whether the Bessel beam or the traditional beacon is employed. Comparison is made with the response for an artificial eye to discount systemic variations. Conclusion Significant evidence is accrued to indicate the reduced fluctuations in fixation when the Bessel beam is employed to create the beacon.
ISSN:0275-5408
1475-1313
DOI:10.1111/opo.12071