The purpose of this project was to design and construct an electronic flash afterimage device. This unit, coined the Haidinger Flash (HF), incorporates a variable flash aperature and also a haidinger brush. The function of the haidinger brush is to improve accuracy in the placement of foveally centered afterimages. These features offer some advantages over current methods used to deliver afterimages. Uses of the device in retinal correspondance testing and in pleoptic therapy are discussed.
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