Wavelength Dependence of the Ocular Straylight

Ginis, Harilaos; Pérez, Guillermo Martínez; Bueno, Juan M.; Pennos, Alexandros; Artal, Pablo

doi:10.1167/iovs.13-11697

Cited by 34 publications

(51 citation statements)

References 25 publications

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“…The latter means that the effect of scattering will be greater, or better more noticeable, when the image has both high reflective and high absorbing areas, in the same way that visually, scattering is much more noticeable when driving at night, where the dynamic range is large due to the headlights, than when at day. A first result, is the consistently lower amount of scattering at green, compared to blue and red, which is in line with a previous study [18]. For the longer wavelengths, however, there is an additional parameter that needs to be taken into account: melanin pigmentation.…”

Section: Discussionsupporting

confidence: 90%

“…Using the method of optical integration [16,18] the wide angle PSF was reconstructed for various wavelengths and it was then used to compensate its effect in fundus imaging. This compensation had an effect on the contrast of the image with an increase of 8.7%.…”

Section: Discussionmentioning

confidence: 99%

“…In an optical system however, fundus diffusion can be dominant in the PSF, and its domain of contribution depends on the wavelength [18]. Therefore, to avoid the intrusion effect of fundus diffusion, the fit was limited to data over 2.5 degrees, or in the case of longer wavelengths over 3.5 degrees.…”

Section: Psf Retrievalmentioning

confidence: 99%

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Intraocular scattering compensation in retinal imaging

Christaras¹,

Ginis²,

Pennos³

et al. 2016

Biomed. Opt. Express

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Intraocular scattering affects fundus imaging in a similar way that affects vision; it causes a decrease in contrast which depends on both the intrinsic scattering of the eye but also on the dynamic range of the image. Consequently, in cases where the absolute intensity in the fundus image is important, scattering can lead to a wrong estimation. In this paper, a setup capable of acquiring fundus images and estimating objectively intraocular scattering was built, and the acquired images were then used for scattering compensation in fundus imaging. The method consists of two parts: first, reconstruct the individual's wide-angle Point Spread Function (PSF) at a specific wavelength to be used within an enhancement algorithm on an acquired fundus image to compensate for scattering. As a proof of concept, a single pass measurement with a scatter filter was carried out first and the complete algorithm of the PSF reconstruction and the scattering compensation was applied. The advantage of the single pass test is that one can compare the reconstructed image with the original one and see the validity, thus testing the efficiency of the method. Following the test, the algorithm was applied in actual fundus images in human eyes and the effect on the contrast of the image before and after the compensation was compared. The comparison showed that depending on the wavelength, contrast can be reduced by 8.6% under certain conditions. of the human rod photoreceptor mosaic using a confocal adaptive optics scanning ophthalmoscope," Biomed. Opt.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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Intraocular scattering compensation in retinal imaging

Christaras¹,

Ginis²,

Pennos³

et al. 2016

Biomed. Opt. Express

Self Cite

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“…It has been suggested that light emitted towards the pupil from this layer is the result of forward scattering and reflections at interfaces such as vessels and sclera. This situation is more evident at certain wavelengths [8,9] in function of the absorption properties of the pigment epithelium [6].…”

Section: Introductionmentioning

confidence: 98%

Response for light scattered in the ocular fundus from double-pass and Hartmann–Shack estimations

et al. 2016

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Double-pass (DP) and Hartmann-Shack (HS) are complementary techniques based on reflections of light in the ocular fundus that may be used to estimate the optical properties of the human eye. Under conventional data processing, both of these assessment modes provide information on aberrations. In addition, DP data contain the effects of scattering. In the ocular fundus, this phenomenon may arise from the interaction of light with not only the retina, but also deeper layers up to which certain wavelengths may penetrate. In this work, we estimate the response of the ocular fundus to incident light by fitting the deviations between DP and HS estimations using an exponential model. In measurements with negligible intraocular scattering, such differences may be related to the lateral spreading of light that occurs in the ocular fundus due to the diffusive properties of the media at the working wavelength. The proposed model was applied in young healthy eyes to evaluate the performance of scattering in such population. Besides giving a parameter with information on the ocular fundus, the model contributes to the understanding of the differences between DP and HS estimations.http://dx

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“…A group of subjects was tested with photographic diffusers, introducing in this way specific amounts of straylight. The results were compared with those provided by two independent devices, a device providing psychophysically subjective measurements of the intraocular straylight [16] and an objective instrument [17] based on the optical integration principle [14,18] to optically quantify the amount of intraocular straylight.…”

Section: Introductionmentioning

confidence: 99%

Performance of a differential contrast sensitivity method to measure intraocular scattering

Pennos

Ginis

Arias

et al. 2017

Biomed. Opt. Express

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Increased intraocular scatter degrades quality of vision, especially in the presence of glare sources. Standard tests, such as visual acuity, are not well suited to capture this condition. There are specific methods to measure intraocular scatter, but require dedicated instruments. In this work, we propose a method to estimate the amount of scatter by combining to sequential measurements of the contrast sensitivity function for two conditions, with and without a glare source. We applied the approach in a group of young subjects with no know ocular pathology fitted with photographic diffusing filters. The straylight estimates were compared with those provided by two alternative techniques, one based on the compensation comparison method and the other the optical integration. The results obtained with the three approaches were in a good agreement, demonstrating the feasibility of the proposed method.

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Wavelength Dependence of the Ocular Straylight

Cited by 34 publications

References 25 publications

Intraocular scattering compensation in retinal imaging

Intraocular scattering compensation in retinal imaging

Response for light scattered in the ocular fundus from double-pass and Hartmann–Shack estimations

Performance of a differential contrast sensitivity method to measure intraocular scattering

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