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A twin register for eye studies and need for collaboration.

This twin register was organized as a resource for studies on the eye. It has been possible to share this resource with other disciplines through effective collaboration. Conversely, only through the assistance of other investigators who are working with twins, will it be practical to undertake certain studies which are important in oph thalmology. The purpose of this presentation is to convey a description of our reg ister and some of its limitations, and to specify the need for collaboration with others. The original purpose in assembling this register to identify a group of twins readily available for multiple clinical examinations.