THE OPTICAL MODELING OF THE HUMAN LENS

G SMITH, BK PIERSCIONEK, DA ATCHISON

    Research output: Contribution to journalArticle

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    Abstract

    The effect of varying lens shape factors and refractive index distribution on two lens performance characteristics (equivalent power and spherical aberration) are considered, using a mathematical model of the human lens which is based upon ellipsoidal iso-indical contours. Values of radii of curvature based on the work of various authors are used to determine asphericity and these inferred values compared with previous measurements. Discrepancies are found and although asphericity has no effect on equivalent power, it does affect the spherical aberration. Based on preliminary findings of the refractive index distribution in the equatorial plane of human lenses, the index distribution is described by a polynomial in the Y (the distance from the optical axis in the equatorial plane), the coefficients of which are polynomials in Z (the distance along the optical axis). The shape of the index profile was found to have a significant effect on the equivalent power and spherical aberration of the lens. The results indicate that more information on surface asphericity and accurate measurement of the index profile in the sagittal plane are required for more accurate modelling of the human lens.
    LanguageEnglish
    Pages359-369
    JournalOPHTHALMIC AND PHYSIOLOGICAL OPTICS
    Volume11
    Issue number4
    Publication statusPublished - Oct 1991

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    lenses
    asphericity
    aberration
    polynomials
    refractivity
    profiles
    mathematical models
    curvature
    radii
    coefficients

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    SMITH, G., PIERSCIONEK, BK., & ATCHISON, DA. (1991). THE OPTICAL MODELING OF THE HUMAN LENS. OPHTHALMIC AND PHYSIOLOGICAL OPTICS, 11(4), 359-369.
    SMITH, G ; PIERSCIONEK, BK ; ATCHISON, DA. / THE OPTICAL MODELING OF THE HUMAN LENS. In: OPHTHALMIC AND PHYSIOLOGICAL OPTICS. 1991 ; Vol. 11, No. 4. pp. 359-369.
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    SMITH, G, PIERSCIONEK, BK & ATCHISON, DA 1991, 'THE OPTICAL MODELING OF THE HUMAN LENS', OPHTHALMIC AND PHYSIOLOGICAL OPTICS, vol. 11, no. 4, pp. 359-369.

    THE OPTICAL MODELING OF THE HUMAN LENS. / SMITH, G; PIERSCIONEK, BK; ATCHISON, DA.

    In: OPHTHALMIC AND PHYSIOLOGICAL OPTICS, Vol. 11, No. 4, 10.1991, p. 359-369.

    Research output: Contribution to journalArticle

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    AB - The effect of varying lens shape factors and refractive index distribution on two lens performance characteristics (equivalent power and spherical aberration) are considered, using a mathematical model of the human lens which is based upon ellipsoidal iso-indical contours. Values of radii of curvature based on the work of various authors are used to determine asphericity and these inferred values compared with previous measurements. Discrepancies are found and although asphericity has no effect on equivalent power, it does affect the spherical aberration. Based on preliminary findings of the refractive index distribution in the equatorial plane of human lenses, the index distribution is described by a polynomial in the Y (the distance from the optical axis in the equatorial plane), the coefficients of which are polynomials in Z (the distance along the optical axis). The shape of the index profile was found to have a significant effect on the equivalent power and spherical aberration of the lens. The results indicate that more information on surface asphericity and accurate measurement of the index profile in the sagittal plane are required for more accurate modelling of the human lens.

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    SMITH G, PIERSCIONEK BK, ATCHISON DA. THE OPTICAL MODELING OF THE HUMAN LENS. OPHTHALMIC AND PHYSIOLOGICAL OPTICS. 1991 Oct;11(4):359-369.