Optec-900

A Lantern made to replace the defunct Farnsworth Lantern. The Optec-900 is seen as a direct replacement and is slightly more restrictive that the original Farnsworth. While 24% of subjects with CVD pass the Farnsworth Lantern, only 19% pass the Optec-900 (Cole 2006), so the original Farnsworth Lantern should be preferred by the colorblind, if available.