TYPICAL AND ATYPICAL MONOCHROMACY STUDIED BY SPECIFIC QUANTITATIVE PERIMETRY

@article{Hansen1979TYPICALAA,
  title={TYPICAL AND ATYPICAL MONOCHROMACY STUDIED BY SPECIFIC QUANTITATIVE PERIMETRY},
  author={Egill Hansen},
  journal={Acta Ophthalmologica},
  year={1979},
  volume={57}
}
  • E. Hansen
  • Published 1 April 1979
  • Physics
  • Acta Ophthalmologica
Two blue cone monochromats and four rod monochromats have been studied by increment threshold measurements applying the Stiles' principle. Some rudimentary colour discrimination was reported by the blue cone monochromats. One patient showed good discrimination between short‐ and middle‐wavelength lights in matching experiments using the Nagel II apparatus. His neutral band in the spectrum was at ΛΛ = 485–495 nm. Dichromatic vision could not be proved in the other patient. 

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References

SHOWING 1-10 OF 25 REFERENCES

Colour vision in blue‐cone ‘monochromacy’

Atypical (blue cone) monochromats show two action spectra when tested by the increment threshold method of Stiles with ‘central’ fixation that resembles rhodopsin modified slightly by photostable macular pigment.

Threshold measurements of spectral sensitivity in a blue monocone monochromat.

Threshold measurements of spectral sensitivity were obtained from a blue monocone monochromat using a foveal fixation target and it is suggested that the V>.

π1 Cone Monochromatism

The results of spectral tests on the color vision of one of the patients (the propositus) are reported and Spivey found convincing evidence for the existence of two different kinds of photoreceptors in the propositus' retina.

Transient tritanopia experiment in blue cone monochromacy

The experimental results obtained with such a person where no suppression effect upon the blue mechanism could be demonstrated are reported and are compared with those of a typical rod monochromat and a person with normal vision.

Visual acuity in the blue cone monochromat

1. To isolate the blue cones of the normal eye, blue sine‐wave gratings were superimposed on a bright yellow background. Threshold contrasts for resolution of the gratings were then determined.

Colour vision in blueAlpern

  • 1965

Der normale Farbensinn und seine Abweichungen

  • Deutsche ophthalmologische Gesellschaft. Bericht
  • 1964