Human eye anisoplanatism: eye as a lamellar structure

Дубинин, А. В.; Cherezova, Tatyana Yu.; Belyakov, Alexey; Kudryashov, Alexis

doi:10.1117/12.650103

Cited by 6 publications

(11 citation statements)

References 8 publications

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“…This step ensures that cones are counted only once. The cone counting results from the second highest intensity section (236-245) and the last intensity section (16)(17)(18)(19)(20)(21)(22)(23)(24)(25) are shown in Figs. 3(e) and 3(f), respectively. Figure 3(g) shows the outcome of cone counting with all the cones highlighted.…”

Section: Cone Density Measurement Algorithmmentioning

confidence: 99%

“…First, the field of view can be as small as a few degrees or less owing to the limited isoplanatic patch size of the eye, 18,19 hence, many images must be montaged together to obtain a better overall perspective. Second, cone densities 20 can be as high as 324,000 cones/ mm 2 , so there is a need for automated photoreceptor counting for both research and clinical applications.…”

Section: Introductionmentioning

confidence: 99%

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Photoreceptor counting and montaging of en-face retinal images from an adaptive optics fundus camera

et al. 2007

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Section: Cone Density Measurement Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoreceptor counting and montaging of en-face retinal images from an adaptive optics fundus camera

et al. 2007

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“…This meant that there was always an off-set between the corner used for fixation and the sensing beam of less than 1.9 degrees. The isoplanatic patch of the eye has been estimated to be between 1.5 to 2.5deg [14], hence this off-set should be of little impact on the aberration measurements when compared against those ones measured foveally. However, if the differences were larger they would not affect the methodology presented as the off-set was kept constant throughout the data collection session.…”

Section: Data Collectionmentioning

confidence: 99%

New methodology to measure the dynamics of ocular wave front aberrations during small amplitude changes of accommodation

Diaz-Santana¹,

Guériaux²,

Arden³

et al. 2007

Opt. Express

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. Abstract: We present a methodology to measure the systematic changes of aberrations induced by small changes in amplitude of accommodation. We use a method similar the one used in electrophysiology, where a periodic stimulus is presented to the eye and many periods (epochs) of the stimulus are averaged. Using this technique we have measured changes in higher order aberrations from 0.006µm to 0.02µm and correlated them with amplitude changes of accommodation as small as 0.14D. These small changes would have been undetectable without epoch averaging. The correlation coefficients of Zernike terms with defocus were calculated, demonstrating higher values of correlation for epoch averaging. The accurate monitoring of defocus at the start of the accommodation response has shown some interesting trends that may be related with the mechanisms behind accommodation. Permanent repository link

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“…If the imaging FOV is greater than the isoplanatic angle, then the adaptive compensation effect will be lost. [28][29][30] However, the illumination spot projected on the retina should be a "point source" to ensure the wavefront sensing accuracy. If the illumination area on the fundus is too large, the light spots on the SH-WFS will link to each other and result in detection error, as shown in Fig.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Optimization of the open-loop liquid crystal adaptive optics retinal imaging system

Ningning

Mao

et al. 2012

J. Biomed. Opt.

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Abstract. An open-loop adaptive optics (AO) system for retinal imaging was constructed using a liquid crystal spatial light modulator (LC-SLM) as the wavefront compensator. Due to the dispersion of the LC-SLM, there was only one illumination source for both aberration detection and retinal imaging in this system. To increase the field of view (FOV) for retinal imaging, a modified mechanical shutter was integrated into the illumination channel to control the size of the illumination spot on the fundus. The AO loop was operated in a pulsing mode, and the fundus was illuminated twice by two laser impulses in a single AO correction loop. As a result, the FOV for retinal imaging was increased to 1.7-deg without compromising the aberration detection accuracy. The correction precision of the open-loop AO system was evaluated in a closed-loop configuration; the residual error is approximately 0.0909λ (root-mean-square, RMS), and the Strehl ratio ranges to 0.7217. Two subjects with differing rates of myopia (-3D and -5D) were tested. High-resolution images of capillaries and photoreceptors were obtained.

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Human eye anisoplanatism: eye as a lamellar structure

Cited by 6 publications

References 8 publications

Photoreceptor counting and montaging of en-face retinal images from an adaptive optics fundus camera

Photoreceptor counting and montaging of en-face retinal images from an adaptive optics fundus camera

New methodology to measure the dynamics of ocular wave front aberrations during small amplitude changes of accommodation

Optimization of the open-loop liquid crystal adaptive optics retinal imaging system

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