Blind spot enlargement as a manifestation of multifocal choroiditis.

Enlargement of the blind spot without optic disc edema has been reported in patients with no other ocular findings (acute idiopathic blind spot enlargement) and in patients with multiple evanescent white dot syndrome. We describe three patients with multifocal choroiditis who developed acute symptomatic enlargement of the blind spot. All three patients were young women in excellent health. During the course of the blind spot enlargement, the appearance of the optic nerve remained normal. We demonstrate that acute enlargement of the blind spot without disc edema occurs in patients with multifocal choroiditis. This enlargement is likely due to peripapillary retinal dysfunction. We speculate on the association of multifocal choroiditis with acute idiopathic blind spot enlargement and multiple evanescent white dot syndrome.