The Luckiesh-Berens tangent screen illuminator.

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@article{Berens1947TheLT, title={The Luckiesh-Berens tangent screen illuminator.}, author={C Berens and M Luckiesh}, journal={Transactions - American Academy of Ophthalmology and Otolaryngology. American Academy of Ophthalmology and Otolaryngology}, year={1947}, volume={51}, pages={304} }