Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

A luminous efficiency function, V*(lambda), for daylight adaptation.

Lindsay T Sharpe1, Andrew Stockman, Wolfgang Jagla

  • 1Institute of Ophthalmology, University College London, London, United Kingdom. ltsharpe@cvrl.org

Journal of Vision
|January 31, 2006
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

VEGFR2 deletion increases susceptibility to photoreceptor degeneration through glial-neuronal interaction.

Cell death & disease·2026
Same author

Importance of individual differences in cone spectral sensitivities and color matching functions and how to correct for them: tutorial.

Journal of the Optical Society of America. A, Optics, image science, and vision·2026
Same author

Gene Expression Profiling Provides an Improved Characterization of <i>CD79B</i>-Mutated Diffuse Large B-Cell Lymphomas.

Journal of personalized medicine·2025
Same author

Individual color matches and cone spectral sensitivities in 100 observers of varying age.

Optics express·2025
Same author

Light-based manipulation of visual processing speed during soccer-specific training has a positive impact on visual and visuomotor abilities in professional soccer players.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2024
Same author

Individual differences in color matches and cone spectral sensitivities in 51 young adults.

Optics express·2024
Same journal

AI-generated faces are becoming more trustworthy.

Journal of vision·2026
Same journal

Attenuated boundary extension in observer perspective memory compared to field perspective memory.

Journal of vision·2026
Same journal

Comparing masking and habituation roles in saccadic omission of stimuli optimized for intra-saccadic vision.

Journal of vision·2026
Same journal

Analysis of human visual experience data.

Journal of vision·2026
Same journal

Pyramid-based Bayesian modeling for high-resolution behavioral analysis.

Journal of vision·2026
Same journal

Sensation without perception: The white whale effect and perceptual blindness in autonomous vehicles.

Journal of vision·2026
See all related articles

A new luminosity function, V*(lambda), enhances the CIE 1924 V(lambda) by aligning with Stockman & Sharpe cone fundamentals. This improved function is based on flicker photometry data from diverse observers, offering greater accuracy for luminance specification.

Area of Science:

  • Vision science
  • Photometry
  • Colorimetry

Background:

  • The CIE 1924 V(lambda) function and its modifications by Judd (1951) and Vos (1978) are foundational but have limitations.
  • Modern understanding of cone photoreceptors, particularly the Stockman & Sharpe (2000) L- and M-cone fundamentals, offers opportunities for improved luminosity functions.
  • Human visual perception of light and color is mediated by cone photopigments, with variations in L-cone photopigment (serine/alanine variants) influencing spectral sensitivity.

Purpose of the Study:

  • To propose a new luminosity function, V*(lambda), that refines existing models.
  • To ensure consistency between the new luminosity function and the Stockman & Sharpe (2000) cone fundamentals.
  • To provide a more accurate and reliable standard for luminance specification under reproducible daylight conditions.

Related Experiment Videos

Main Methods:

  • Experimental determination of heterochromatic flicker photometric data at 25 Hz using a 2-degree field.
  • Data collection from 40 observers with known L-cone photopigment genotypes (serine/alanine variants).
  • Photometric matches performed across a range of wavelengths (425–675 nm) under controlled, high retinal illuminance conditions.

Main Results:

  • A new luminosity function, V*(lambda) = 1.55L(lambda) + M(lambda), was derived.
  • The function is consistent with Stockman & Sharpe (2000) L- and M-cone fundamentals.
  • The observer cohort's L-cone pigment polymorphism (58% serine, 42% alanine) closely matches the general population (56:44).

Conclusions:

  • The proposed V*(lambda) function offers improvements over previous luminosity functions.
  • It provides a luminance standard consistent with current cone fundamental models and flicker photometry.
  • The function is suitable for specifying luminance under reproducible standard daylight conditions, accounting for L-cone pigment variations.