Age-related macular degeneration (AMD) with CNV is the most common cause of irreversible severe loss of vision in older adults. The Macular Photocoagulation Study (MPS) Group, sponsored by the National Eye Institute, demonstrated that laser treatment is effective for recurrent subfoveal CNV (that extends into the center of the macula) after laser treatment and for selected patients with subfoveal CNV who had no prior treatment. More recently, photodynamic therapy with verteporfin was shown to reduce the risk of moderate and server loss of vision in selected patients with subfoveal neovascularization associated with AMD. Choroidal neovascularization due to OHS affects adults of working age and may pose a lifelong risk of blindness to people who have characteristic scars ("histo spots") in the macula. It has been estimated that 2,000,000 people who live or have lived in the region of the United States in which histoplasmosis is endemic have characteristic histo spots and that 100,000 of them will lose vision in one or both eyes due to CNV. Fortunately, the effectiveness of laser photocoagulation for treating CNV due to OHS that is not subfoveal (i.e., not extending into the center of the macula) also has been demonstrated by the MPS Group in two randomized clinical trials. However, treated patients are at risk of subfoveal recurrence, and laser treatment cannot be applied to these patients or to other patients with OHS who present with subfoveal CNV in the absence of prior laser treatment.