VARIATIONS IN REFRACTIVE-INDEX AND ABSORBANCY OF 670-NM LIGHT WITH AGE AND CATARACT FORMATION IN HUMAN LENSES

BK PIERSCIONEK

    Research output: Contribution to journal › Article

    Abstract

    A newly-developed fibre-optic sensor (wavelength of 670 nm) was used to measure the index gradient in 16 human lenses ranging in age from 38 to 78 years. Two of these lenses had nuclear cataract. The refractive index, calculated from the proportion of reflected light at the sensor/sample interface, appeared to increase with age and further with cataract formation. This was not consistent with previous studies. The increased losses of reflected light, which gave apparent increased values of refractive index, were reconsidered to be resulting from light absorption and an estimate of relative absorption was made by deducting excess light loss from a base level expected to yield the maximum index value. The characteristics of the relative absorption are similar to those of a red fluorophor reported in other studies.
    LanguageEnglish
    Pages407-413
    JournalExperimental Eye Research
    Volume60
    Issue number4
    Publication statusPublished - Apr 1995

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    cataracts
    lenses
    refractivity
    sensors
    electromagnetic absorption
    fiber optics
    proportion
    gradients
    estimates
    wavelengths

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    PIERSCIONEK, BK. / VARIATIONS IN REFRACTIVE-INDEX AND ABSORBANCY OF 670-NM LIGHT WITH AGE AND CATARACT FORMATION IN HUMAN LENSES. In: Experimental Eye Research. 1995 ; Vol. 60, No. 4. pp. 407-413.
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    abstract = "A newly-developed fibre-optic sensor (wavelength of 670 nm) was used to measure the index gradient in 16 human lenses ranging in age from 38 to 78 years. Two of these lenses had nuclear cataract. The refractive index, calculated from the proportion of reflected light at the sensor/sample interface, appeared to increase with age and further with cataract formation. This was not consistent with previous studies. The increased losses of reflected light, which gave apparent increased values of refractive index, were reconsidered to be resulting from light absorption and an estimate of relative absorption was made by deducting excess light loss from a base level expected to yield the maximum index value. The characteristics of the relative absorption are similar to those of a red fluorophor reported in other studies.",
    author = "BK PIERSCIONEK",
    year = "1995",
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    language = "English",
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    PIERSCIONEK, BK 1995, 'VARIATIONS IN REFRACTIVE-INDEX AND ABSORBANCY OF 670-NM LIGHT WITH AGE AND CATARACT FORMATION IN HUMAN LENSES', Experimental Eye Research, vol. 60, no. 4, pp. 407-413.

    VARIATIONS IN REFRACTIVE-INDEX AND ABSORBANCY OF 670-NM LIGHT WITH AGE AND CATARACT FORMATION IN HUMAN LENSES. / PIERSCIONEK, BK.

    In: Experimental Eye Research, Vol. 60, No. 4, 04.1995, p. 407-413.

    Research output: Contribution to journal › Article

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    AB - A newly-developed fibre-optic sensor (wavelength of 670 nm) was used to measure the index gradient in 16 human lenses ranging in age from 38 to 78 years. Two of these lenses had nuclear cataract. The refractive index, calculated from the proportion of reflected light at the sensor/sample interface, appeared to increase with age and further with cataract formation. This was not consistent with previous studies. The increased losses of reflected light, which gave apparent increased values of refractive index, were reconsidered to be resulting from light absorption and an estimate of relative absorption was made by deducting excess light loss from a base level expected to yield the maximum index value. The characteristics of the relative absorption are similar to those of a red fluorophor reported in other studies.

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    PIERSCIONEK BK. VARIATIONS IN REFRACTIVE-INDEX AND ABSORBANCY OF 670-NM LIGHT WITH AGE AND CATARACT FORMATION IN HUMAN LENSES. Experimental Eye Research. 1995 Apr;60(4):407-413.