The Macular Photocoagulation Study (MPS) recently documented the benefit of laser photocoagulation for selected patients with age-related macular degeneration and subfoveal choroidal neovascularization.1-3 All MPS centers used either Zeiss (Carl Zeiss Inc, Thornwood, NJ) or Topcon (Topcon America Corporation, Paramus, NJ) cameras to produce standard 30° stereo fundus photographs and fluorescein angiograms. Both cameras, according to their manufacturers, produce images that are magnified by a factor of 2.5. Lesion size and location, as measured from these standard 30° photographs and fluorescein angiograms, were critical factors in determining which eyes benefited from treatment. The MPS published a replica of their disc area template to aid clinicians in deciding which eyes should be treated.3
Using Canvas (Deneba Software, Miami, Fla), a precision drawing program for the Macintosh personal computer, I created a similar template for my own use. I created circles of 2.0, 3.5, 4.0, and 6.0 disc areas, assuming
Bloom SM. Subfoveal Neovascular Lesions in Age-Related Macular Degeneration. Arch Ophthalmol. 1993;111(7):900–901. doi:10.1001/archopht.1993.01090070018004
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