Generalized algorithm for photoelastic measurements based on phase-stepping imaging polarimetry

Jaronski, Jarosław W.; Kasprzak, Henryk T.

doi:10.1364/ao.38.007018

Cited by 20 publications

(21 citation statements)

References 9 publications

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“…Van Blokland and Verhelst reported that although there is a large variability among subjects, the corneal retardation is non-null and approximately constant at the central area of the pupil plane (558 on average) and increases with eccentricity (for some subjects larger that 2008). Jaronski and Kasprzak (1999) also found an increase in retardation by but they did not report numerical values. Our results show only a slight increase along the radius.…”

Section: Discussionmentioning

confidence: 92%

Spatially resolved polarization properties for in vitro corneas

Bueno

Jaronski

2001

Ophthalmic Physiologic Optic

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Spatially resolved polarization properties of in vitro mammalian corneas have been studied by using a Mueller-matrix imaging polarimeter in transmission mode. Sixteen images corresponding to independent combinations of polarization states in the illumination and analyzing pathways are recorded. Spatially resolved Mueller matrices of the samples are calculated from them. Results show that the birefringence of the cornea is almost linear. Although the magnitude of retardation depends on the sample, it is approximately constant at the center and increases towards the periphery. Dichroism and polarizing power are negligible. Maps of the degree of polarization indicate that the cornea basically does not depolarize the totally polarized incident light.

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Section: Discussionmentioning

confidence: 92%

Spatially resolved polarization properties for in vitro corneas

Bueno

Jaronski

2001

Ophthalmic Physiologic Optic

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“…19 Jaronski and Kasprzak devised a phase stepping imaging polarimetry technique to measure the birefringence of human cornea in vitro, and concluded that corneal birefringence increases monotonically in the direction of the corneal periphery. 20,23 Hitzenberger, Gotzinger and Pircher employed polarization sensitive optical coherence tomography to map the distribution of birefringence at the posterior corneal surface. 21 Their results indicated that birefringence is low for beams incident normal to the corneal surface, and that at oblique angles, measured birefringence increases with deviation from normal incidence.…”

Section: Introductionmentioning

confidence: 99%

Modeling the corneal birefringence of the eye toward the development of a polarimetric glucose sensor

Malik

Coté

2010

J. Biomed. Opt.

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Abstract. Optical polarimetry for monitoring glucose concentration in the aqueous humor of the eye as a potential noninvasive means of assessing blood glucose has promise, but the realization of such an approach has been limited by noise from time-varying corneal birefringence due to motion artifact. Modeling the corneal birefringence of the eye is critically important toward understanding the overall effect of this noise source compared to other changes in the signal, and can aid in design of the polarimetric system. To this end, an eye model is introduced in this work that includes spatially varying birefringence properties of the cornea. The degree of birefringence and the fast axis orientation is calculated as a function of beam position on the anterior chamber. It is shown that the minimum change in polarization vector orientation occurs for beam position near the midpoint between the corneal apex and limbus. In addition, the relative wavelength independence of motion artifact is shown in the same region. The direct consequence of these findings are that a multiwavelength polarimetric system can potentially be utilized to eliminate the effect of time-varying corneal birefringence, and that eye coupling is optimal at the midpoint between the apex and limbus.

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“…Whereas in some areas the angle is positive, in others it is clearly negative, with a variable pattern. The azimuth for the whole eye, and the retina and the cornea themselves has been measured by different authors (Kaplan and Bettelheim, 1972; Bour and Lopes Cardozo, 1981; van Blokland and Verhelst, 1987; klein Brink and van Blokland, 1988; Pelz et al ., 1996; Jaronski and Kasprzak, 1999; Bueno, 2000; Bueno and Jaronski, 2001). To our knowledge this paper presents the first results of a spatially resolved lenticular azimuth.…”

Section: Discussionmentioning

confidence: 99%

Polarization properties of thein vitroold human crystalline lens

Bueno

Campbell

2003

Ophthalmic Physiologic Optic

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We have studied the spatially resolved polarization properties of the in vitro intact old human crystalline lens (from 56 to 88 years old) by using Mueller-matrix imaging polarimetry. Analysis was performed within an average of 54 h of death. Results show that the overall retardation is small (7 degrees on average) and decreases from the centre of the lens to the periphery. Lenticular birefringence is linear but has a spatial dependence, reducing outwards along the radius. The distribution of azimuthal angle of the birefringent structure of the crystalline lens changes depending on each individual lens. Diattenuation and polarizance were found to be small, however, depolarization was about 35% for the set of lenses studied here.

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Generalized algorithm for photoelastic measurements based on phase-stepping imaging polarimetry

Cited by 20 publications

References 9 publications

Spatially resolved polarization properties for in vitro corneas

Spatially resolved polarization properties for in vitro corneas

Modeling the corneal birefringence of the eye toward the development of a polarimetric glucose sensor

Polarization properties of thein vitroold human crystalline lens

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