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Macular photocoagulation. Optimal wavelength selection.

C L Trempe, M A Mainster, O Pomerantzeff

    Ophthalmology
    |July 1, 1982
    PubMed
    Summary
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    Argon green and krypton yellow lasers effectively treat subretinal neovascularization in macular degeneration, closing vessels and preserving vision. Best outcomes occur with early, small neovascular membranes located away from the foveola.

    Area of Science:

    • Ophthalmology
    • Biomedical Optics

    Background:

    • Macular photocoagulation uses lasers to treat neovascularization.
    • Argon blue-green lasers can cause inner retinal damage.
    • Argon green and krypton yellow lasers offer potential advantages.

    Purpose of the Study:

    • Analyze laser wavelengths for macular photocoagulation.
    • Evaluate treatment of subretinal neovascularization in disciform macular degeneration.
    • Assess outcomes of argon green and krypton yellow photocoagulation.

    Main Methods:

    • Comparative analysis of laser light scattering and absorption.
    • Treatment of 74 patients with argon green radiation and 17 with krypton yellow radiation.
    • Repetitive treatment and close follow-up protocol.

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    Main Results:

    • Argon green laser closed neovascularization in 93% of patients.
    • Visual field loss stabilized or improved in 76%, and visual acuity in 70%.
    • Best results achieved with membranes >600 microns from foveola and <2 mm², with 100% closure and 88% visual acuity improvement/stabilization in this subgroup.

    Conclusions:

    • Monochromatic argon green and krypton yellow radiation are effective for subretinal neovascularization.
    • Treatment outcomes are influenced by neovascular membrane location and size.
    • Photocoagulation can preserve or improve visual function in macular degeneration.