June 2013
Volume 54, Issue 15
Free
ARVO Annual Meeting Abstract  |   June 2013
The role of defocus on photoreceptor light coupling analyzed with a waveguide-based retinal simulator
Author Affiliations & Notes
  • Brian Vohnsen
    School of Physics, University College Dublin, Dublin, Ireland
  • Diego Rativa Millan
    Pós-Graduação em Engenharia de Sistemas (PPGES), Universidade de Pernambuco, Recife, Brazil
  • Carmen Vela
    School of Physics, University College Dublin, Dublin, Ireland
  • Benjamin Lochocki
    School of Physics, University College Dublin, Dublin, Ireland
  • Philip Kruger
    College of Optometry, State University of New York, New York, NY
  • Footnotes
    Commercial Relationships Brian Vohnsen, None; Diego Rativa Millan, None; Carmen Vela, None; Benjamin Lochocki, None; Philip Kruger, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2013, Vol.54, 3429. doi:https://doi.org/
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      Brian Vohnsen, Diego Rativa Millan, Carmen Vela, Benjamin Lochocki, Philip Kruger; The role of defocus on photoreceptor light coupling analyzed with a waveguide-based retinal simulator. Invest. Ophthalmol. Vis. Sci. 2013;54(15):3429. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 
Purpose
 

Obliqueness of light at the retina diminishes the visual response as a consequence of the Stiles-Crawford effect caused by photoreceptor waveguiding. The aim of this study is to analyze the sensitivity to defocus under waveguide conditions that resemble those of the human eye retina using a retinal simulator consisting of an array of photonic-crystal waveguides.

 
Methods
 

A liquid-filled photonic crystal fibre array has been used to simulate waveguiding by retinal photoreceptors and the total fraction of coupled light has been measured. Defocus is generated with a Badal-system and monitored simultaneously with a Hartmann-Shack wavefront sensor. Measurements are performed both at 633 nm and at 543 nm wavelength to study a possible chromatic impact. The results are compared with those of an analytical waveguide model and Zemax-based eye models.

 
Results
 

Measurements show that the fraction of coupled light power is sensitive to defocus as expected due to the wavefront curvature at the entrance facet of the waveguides. This is in agreement with the numerical models suggesting a possible role of light power for accommodation and emmetropization of the eye.

 
Conclusions
 

We found that a photonic crystal fibre array is a suitable experimental tool to analyze the role of defocus and more generally aberrations and their possible role on vision and effective retinal images. The fraction of light that couples to waveguide modes may provide a clue for accommodation and emmetropization of the eye. The sign of defocus is not determined but may relate to the chromatic difference for a finite bandwidth or to photoreceptor disarray though also other aberrations and other factors can provide accommodative clues.

  
Keywords: 404 accommodation • 648 photoreceptors • 511 emmetropization  
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