Abstract
The double-pass intensity point-spread function was recorded in four subjects using a monochromatic source emitting at 543 nm, through a 6.7-mm diameter pupil i) at the fovea after adaptive optics correction of the ocular aberrations, ii) at the fovea without adaptive optics correction, and iii) at 2 degrees of eccentricity with adaptive optics correction. The half-width at half-maximum of the double-pass point-spread function was narrower after correction of the ocular aberrations. At 2 degrees of eccentricity this width was larger than at the fovea. The minimum widths were about 1.1 arcmin in dark pigmented eyes and 1.6 arcmin in light pigmented eyes. These values are 6 to 9 times larger than the width expected from diffraction alone.
Highlights
There has been tremendous interest in the limiting factors affecting retinal imaging since the introduction of adaptive optics (AO) to the flood illuminated fundus camera [1,2,3], confocal scanning laser ophthalmoscope [4,5,6], and optical coherence tomography (OCT) [7,8,9,10]
The first line shows the root mean square (RMS) wavefront aberrations obtained during AO correction and its average value over the last second of recording
In young subjects, using an annulus-shaped input pupil of 6.7-mm external diameter and 2.6mm inner diameter, an unobstructed output pupil of 6.7-mm diameter, a wavelength of 543 nm, and careful focusing, we found that the width of the double-pass point-spread function (PSF) after AO correction of the ocular aberrations is always smaller than the width of the double-pass PSF obtained in the same conditions but without AO correction
Summary
There has been tremendous interest in the limiting factors affecting retinal imaging since the introduction of adaptive optics (AO) to the flood illuminated fundus camera [1,2,3], confocal scanning laser ophthalmoscope [4,5,6], and optical coherence tomography (OCT) [7,8,9,10] The performance of these AO systems are usually derived from the ocular aberrations measured by Received 17 Jul 2008; revised 7 Oct 2008; accepted 12 Oct 2008; published 14 Oct 2008 27 October 2008 / Vol 16, No 22 / OPTICS EXPRESS 17349 the wavefront sensor (WS). This result reflects a real change in the retinal images obtained using AO
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