|
The Farnsworth Flashlight is not equivalent to the Farnsworth Lantern |
JOSA A, Vol. 29, Issue 2, pp. A377-A382 (2012)
http://dx.doi.org/10.1364/JOSAA.29.00A377
Enhanced HTML 
Acrobat PDF (823 KB)
Abstract
The Farnsworth Lantern has been accepted in many occupational applications. Modern instruments purporting to be equivalent were inevitable given the ubiquity of its use. The OPTEC900® (Stereo Optical) has been validated and adopted as an acceptable substitute, although the fail rate is slightly higher. The Farnsworth Flashlight (Gulden Ophthalmics) has been marketed without validation. The color and luminous intensities of the three lanterns’ stimuli were measured using a Topcon SR-3 telespectroradiometer and compared with Farnsworth’s recommendations. The OPTEC900® chromaticities comply with Farnsworth’s recommendations, but the luminous intensities are rather different. The Farnsworth Flashlight differs from the Farnsworth Lantern in both chromaticity and luminous intensities. A cheap and portable equivalent to the Farnsworth Lantern is a highly attractive product. However, the Farnsworth Flashlight is significantly different in construction from the Farnsworth Lantern.
© 2012 Optical Society of America
OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1690) Vision, color, and visual optics : Color
ToC Category:
Variations and deficiencies of color vision
History
Original Manuscript: September 1, 2011
Revised Manuscript: December 12, 2011
Manuscript Accepted: December 12, 2011
Published: February 2, 2012
Virtual Issues
Vol. 7, Iss. 4 Virtual Journal for Biomedical Optics
Citation
Stephen Dain, "The Farnsworth Flashlight is not equivalent to the Farnsworth Lantern," J. Opt. Soc. Am. A 29, A377-A382 (2012)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-29-2-A377
You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
Related Journal Articles 
- Relational color constancy in achromatic and isoluminant images (JOSAA)
- Role of perceptual organization in chromatic induction (JOSAA)
- Technique to investigate the temporal phase shift between L- and M-cone inputs to the luminance mechanism (JOSAA)
- Surround articulation. I. Brightness judgments (JOSAA)
- Surround articulation. II. Lightness judgments (JOSAA)
Related Conference Papers
- Correcting Color Images for Stray-Light Effects by Computationally Solving an Inverse Problem via Selected-Ordinate Image (SORI) Processing
- White Light Emissions from Complex Core-Shell Nanoparticles
- OSA Rochester Section Optics Suitcase: a forty-minute middle school outreach program for the cost of a postage stamp
- Multi-Disciplinary Lidar Applications
- Multi-Disciplinary Lidar Applications
« Previous Article | Next Article »
OSA is a member of 