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Reduction of speckles in retinal reflection
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Ocular wave-front sensor. The acoustic cell is positioned immediately after the laser diode. After scattering from the retina, the beam is relayed to the HS lenslet array and again to the HS camera. The beam is recorded by the retinal camera.

Image of FIG. 2.
FIG. 2.

Retinal and HS images (see also supplementing movies): (a) retinal spot, cell off; (b) retinal image, cell on, diffraction; (c) retinal image, diffraction; (d) pupil image, cell off, with speckle and saturation; (e) same HS pattern, cell on, with reduced speckle; (f) pupil image, dense lenslets, cell off; and (g) same, cell on.

Image of FIG. 3.
FIG. 3.

(Color online) Power spectrum of a HS pattern with (a) cell on and (b) off (log scale). While the signal is fully conserved, the background noise drops when the cell is on.

Image of FIG. 4.
FIG. 4.

(Color online) Average of 12 wave fronts with cell on (a) and off (b); (c) and (d) associated standard deviations. Accommodation and pupil size changed slightly between acquired sets. Piston, tip, tilt, and defocus were subtracted from the wave front.

Image of FIG. 5.
FIG. 5.

(Color online) Zernike coefficients of Fig. 4 (top) and their distributions (bottom). The live eye contributed to some of the difference between the cell being off (green bars) and on (yellow bars). To bring out the higher terms, we show the cubic root of the Zernike coefficients.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reduction of speckles in retinal reflection