I HAVE not been able to discover any references in the literature to the transplantation of human vitreous from the eye of one person to the eye of another person. It is believed that the cases reported here are the first recorded instances of this procedure. This report is based on some as yet unpublished experiments on transplantation of vitreous in animal eyes. HISTORICAL REVIEW Although there are no reported cases of the transplantation of human vitreous, there have been various attempts to provide a clearer vitreous by other methods. In 1890 Ford1withdrew vitreous from several eyes, the loss being made up by the aqueous. He reported improvement in visual acuity from perception of light to 20/60 in 1 case. Deutschmann,2in 1906, reported on the injection of vitreous from calf and rabbit eyes into human eyes for the treatment of detachment of the retina. Of 67