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Related Experiment Videos

Effects of cataract surgery on corneal function

B A Holden, K A Polse, D Fonn

    Investigative Ophthalmology & Visual Science
    |March 1, 1982
    PubMed
    Summary

    Aphakic eyes show significantly less corneal swelling from low oxygen compared to phakic eyes. This reduced edema in aphakic eyes may stem from lower metabolic activity or increased lactate removal.

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    Area of Science:

    • Ophthalmology
    • Corneal Physiology
    • Contact Lens Research

    Background:

    • Aphakic eyes reportedly exhibit reduced corneal edema during hydrogel contact lens wear compared to phakic eyes.
    • Understanding the physiological differences contributing to this phenomenon is crucial for contact lens safety and patient care.

    Purpose of the Study:

    • To investigate ocular characteristics that may explain the reduced corneal edema in aphakic eyes under hypoxic conditions.
    • To compare the swelling response of aphakic and phakic corneas to experimentally induced hypoxia.

    Main Methods:

    • Measured ocular parameters including epithelial oxygen uptake, endothelial cell count, corneal sensitivity, and epithelial thickness in unilateral aphakic subjects.
    • Exposed both aphakic and phakic eyes to reduced oxygen environments using hydrogel contact lenses and nitrogen gas exposure.
    • Quantified corneal swelling and edema distribution (stromal layer).

    Main Results:

    • Aphakic eyes demonstrated significantly lower corneal swelling (7.5% vs. 11.0% with lenses; 4.3% vs. 6.2% with nitrogen) compared to phakic eyes (p < 0.01).
    • Aphakic eyes exhibited lower epithelial oxygen uptake (15%), fewer endothelial cells (18%), reduced corneal sensitivity (85%), and thinner epithelium (8%).
    • Eighty-five percent of the observed edema was localized to the corneal stroma.

    Conclusions:

    • The reduced corneal swelling in aphakic eyes under hypoxia is significant and consistent across different experimental conditions.
    • Potential explanations include decreased epithelial metabolic activity or enhanced lactate efflux due to increased endothelial permeability in aphakic eyes.

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