Laser‐diffraction Patterns of Highly Ordered Superstructures in the Lenses of Bovine Eyes

Bettelheim, Frederick A.; Vinciguerra, Michael J.

doi:10.1111/j.1749-6632.1971.tb34944.x

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…Laser diffraction patterns of bovine lenses at such angles also yielded dimensions between 10-20 fl that can be confirmed by electron microscopy. 20 The width of the distribution function of rod orientation a=2.0 is also reasonably wide, indicating that the preferential orientation is really superimposed upon a random orientation. Similar conclusions were reached earlier.…”

Section: 5mentioning

confidence: 78%

CORNEA MODEL: Light-Scattering Patterns from a Two-Dimensional Nonrandom Assembly of Anisotropic Rods

Kumbar

Bettelheim

1975

Polym J

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ABSTRACT:The light scattered by a cornea occurs mainly at small angles. The patterns obtained experimentally showed a characteristic maxima at oo angles and a four lobe 0-90° pattern in the h mode and a two lobe 0-180° pattern in the In mode. A model system is presented here in which anisotropic rods (collagen fibrils) embedded in an isotropic medium (ground substances) form a two-dimensional assembly (lamellae) which are stacked in a nonrandom fashion (stroma). The light-scattering patterns from such a model system were calculated by varying a number of parameters, such as the length of the rod, its average orientation, etc. Thus the role of each parameter in the model in influencing light-scattering patterns in I+ and In mode was evaluated. Finally, the computer-simulated patterns were matched to the experimental patterns and the numerical values of the parmeters of the model were obtained.

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Section: 5mentioning

confidence: 78%

CORNEA MODEL: Light-Scattering Patterns from a Two-Dimensional Nonrandom Assembly of Anisotropic Rods

Kumbar

Bettelheim

1975

Polym J

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“…This simple theory is applicable to thin lens sections only. In thick lens sections, or in the whole lens, an additional scattering ocurs due to the regular spacings of cell membranes that give rise to simple or multiple diffraction patterns (Bettelheim and Vinciguerra, 1971;Bettelheim et al, 1973). The use of thin lens sections ('10 ,m) reduces the diffraction effect, and the angular dependence intensity yields a smooth curve (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…In a normal lens, most of the scattering comes from the fiber cell membranes that have higher refractive index than the surrounding cytoplasm. When fiber cells are regularly packed, the scattering gives rise to a diffraction pattern (Bettelheim and Vinciguerra, 1971;Bettelheim et al, 1973;Philipson, 1973). It has been suggested that such light scattering causes the halo around bright objects.…”

Section: Introductionmentioning

confidence: 99%

Light scattering of normal human lens I. Application of random density and orientation fluctuation theory

Bettelheim¹,

Paunovic²

1979

Biophysical Journal

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Light-scattering intensities in the I parallel and I+ mode were obtained on thin sections of three human lenses. Random density and orientation fluctuation theory, without cross correlation, was employed to evaluate light-scattering parameters. Both the density correlation distances, as well as the orientation correlation distances, were related to structural elements in the lens fiber cell that have been observed by other investigators with different techniques. The magnitude of these fluctuations were evaluated, and it was demonstrated that the density fluctuations are the main contributors to light scattering in normal human lenses. Changes in the light-scattering parameters were evaluated as a function of position within the lens. The changes observed agree with the biochemical data in the literature that reflects that an aging process occurs when one proceeds from the periphery of the lens toward the center.

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Biological–Physical Basis of Lens Transparency

Bettelheim¹,

Siew²

1982

Cell Biology of the Eye

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Laser‐diffraction Patterns of Highly Ordered Superstructures in the Lenses of Bovine Eyes

Cited by 6 publications

References 9 publications

CORNEA MODEL: Light-Scattering Patterns from a Two-Dimensional Nonrandom Assembly of Anisotropic Rods

CORNEA MODEL: Light-Scattering Patterns from a Two-Dimensional Nonrandom Assembly of Anisotropic Rods

Light scattering of normal human lens I. Application of random density and orientation fluctuation theory

Biological–Physical Basis of Lens Transparency

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