Colour vision: A patchwork of cones

  title={Colour vision: A patchwork of cones},
  author={Heinz Wässle},
Primates — humans, monkeys and apes — have a very different retinal structure to that of other mammals. We use a trichromatic system, made up of three types of cone cell with peak sensitivities in different regions of the visual spectrum. Now, using an imaginative new technique, we can take our first look at the arrangement of these cones in the living human retina. 
12 Citations

Contrast Sensitivity and Limits of Vision

In this chapter, contrast and related functions, the physiology of contrast detection, the limits of vision, and currently available contrast tests are examined.

Parallel processing in the mammalian retina

The authors' eyes send different 'images' of the outside world to the brain — an image of contours (line drawing), a colour image (watercolour painting) or a image of moving objects (movie) — and circuits that involve complex inhibitory and excitatory interactions represent filters that select 'what the eye tells the brain'.

Decomposing a Cone's Output (Parallel Processing)

  • H. Wässle
  • Biology
    The Senses: A Comprehensive Reference
  • 2020


New electromagnetic models for the rods and conesthat are the photoreceptors at the back of the retina are developed and simulated in order to explain the roles of dimension, geometrical structure, directionalsensitivity, and visual pigment softness.

Deep Homology?: Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo

Deep Homology?: Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo is Lewis Held's final act in a threepart series discussing developmental evolution. Part one of the series−Quirks of

Absorbance and Light Scattering of Lenses Organ Cultured with Glucose

The absorbance and light scattering of glucose treated lenses in organ culture were quantitated for the first time which could be important for future studies designed to test the efficacy of agents to ameliorate the opacity.

Colorimetry and Physiology – The LMS Specification

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and



The spatial arrangement of cones in the primate fovea

Direct microspectrophotometric measurements of patches of foveal retina from Old World monkeys are made, and it is reported here that the distribu tion of long- and middle-wave cones is locally random.

The arrangement of the three cone classes in the living human eye

Adaptive optics and retinal densitometry are combined to obtain the first images of the arrangement of S, M and L cones in the living human eye, allowing the sharpest images ever taken of the living retina.

The 'blue-on' opponent pathway in primate retina originates from a distinct bistratified ganglion cell type

The results thus demonstrate an anatomically distinct pathway that conveys S-cone signals to the brain, and the morphology of the blue-on cell suggests a novel hypothesis for the retinal circuitry underlying the blue–yellow opponent response.

Treatise on Physiological Optics

A composite thin film resistor is disclosed, including an electrically inert substrate upon which is deposited a nickel-chromium alloy thin film, and an overlying second thin film - which is initially deposited as metallic tantalum - which provides a very high degree of environmental protection with respect to the Ni-Cr film.

Spectral sensitivity of human cone photoreceptors

Spectral sensitivities of 'green' and 'red' cones, determined over the entire visible region, show peaks near 530 and 560 nm respectively, and are remarkably similar to those of the old-world monkey Macaco fascicularis, which satisfactorily predict the photopic luminosity function, a measure of the sensitivity of cone-mediated human vision to light of different wavelengths.