• Macular photocoagulation requires precise localization of abnormalities to be treated, in order to accomplish the aims of therapy without unnecessarily damaging adjacent tissue. A method is described by which a color fundus photo or a fluorescein image can be projected through a beam splitter into the ocular of a laser slit lamp, thus affording an image congruent with the surgeon's view of the patient's macula.
Gaynon MW. Integrated Projection of Fundus Photographs During Macular Photocoagulation. Arch Ophthalmol. 1984;102(3):464–465. doi:10.1001/archopht.1984.01040030378043
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