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  Vol. 108 No. 6, June 1990 TABLE OF CONTENTS
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Krypton Laser Photocoagulation for Neovascular Lesions of Age-Related Macular Degeneration

Results of a Randomized Clinical Trial

Macular Photocoagulation Study Group

Arch Ophthalmol. 1990;108(6):816-824.


Abstract

• The Age-Related Macular Degeneration Study-Krypton Laser (AMDS-K) is a multicenter controlled clinical trial designed to determine whether krypton red laser photocoagulation is of value in preventing visual acuity loss in eyes with macular degeneration that have either choroidal neovascularization 1 to 199 µm from the center of the foveal avascular zone or choroidal neovascularization 200 µm or farther from the foveal avascular zone center with blood and/or blocked fluorescence extending within 200 µm of the foveal avascular zone center. Recruitment ended in December 1987 after 247 patients had been assigned to photocoagulation and 249 patients had been assigned to no treatment. At 3 years after randomization, 49% (86/174) of treated eyes, in contrast to 58% (98/169) of untreated eyes, had lost six or more lines of visual acuity. The average visual acuity of treated and untreated eyes at that time was 20/200 and 20/250, respectively. The benefit of laser treatment was largest among patients without evidence of hypertension and diminished to no apparent benefit among patients who had highly elevated blood pressure and/or used antihypertensive medication. Treatment of lesions meeting the AMDS-K eligibility criteria in eyes of patients with no hypertension is recommended. However, treatment cannot be recommended uniformly for patients with definite hypertension having lesions similar to those of patients enrolled in the AMDS-K.




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