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Peripheral refraction in aphakic eyes.

M Millodot

    American Journal of Optometry and Physiological Optics
    |September 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Aphakic eyes exhibit significantly less oblique astigmatism than phakic eyes, indicating the crystalline lens greatly influences this refractive error. Eye astigmatism increases with age, primarily due to lens changes, suggesting age-related lens sphericalization.

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    Area of Science:

    • Ophthalmology and Optometry
    • Ocular Biomechanics

    Background:

    • Oblique astigmatism is a common refractive error affecting visual quality.
    • The crystalline lens is known to contribute to the overall refractive power and astigmatism of the eye.

    Purpose of the Study:

    • To investigate the role of the crystalline lens in oblique astigmatism.
    • To compare oblique astigmatism in aphakic (lens-absent) and phakic (lens-present) eyes across different age groups.

    Main Methods:

    • Peripheral refraction was measured using a Topcon refractometer.
    • Aphakic and age-matched control (phakic) eyes were analyzed.
    • Data from young aphakic patients were compared with existing literature.

    Main Results:

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  • Aphakic eyes demonstrated substantially less oblique astigmatism compared to age-matched phakic eyes.
  • Total oblique astigmatism increased with age, while corneal astigmatism remained relatively constant.
  • In older individuals, total oblique astigmatism approached theoretical values, suggesting lens sphericalization.

    • Conclusions:

    • The crystalline lens plays a significant role in the development of oblique astigmatism.
    • Age-related increases in oblique astigmatism are largely attributable to changes within the crystalline lens.
    • The aging process appears to lead to a more spherical crystalline lens.