20/10 Perfect Vision Optische Geraete GmbH
Aaltonen Viljakaisa
Abe Kuniomi
Abourizk Mark A.
Abraham Fabian
Abraham Gyorgy
Acier Bruno
Acmed, Inc.
AcuNetx, Inc.
Adam R. Stephenson, Ltd
Adaptive Optics Associates,.Inc.
Adel Mike
Aeba Hidetaka
Ahonen Janne
Aiello Lloyd M.
Aiura Hirochika
Akita Junichi
Akiyama Koichi
Akiyama Kouichi
Akkolens International B.V.