Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Pathologic scotopization: A shortened Nagel-II anomaloscopic micro-screw method

  • 23 Accesses

  • 2 Citations

Abstract

The Nagel-II micro-screw method uses eleven colour equations between 620 and 560 nm. The luminance settings are given and are based on the data of colour normal individuals. In the shortened version, intended to detect pathologic scotopization, it is ascertained at which position of the micro-screw the patient's colour adjustments drop beneath the level of 60 scale Units. A total of 64 patients was examined, 29 congenital colour defectives and 35 acquired colour defectives. With the shortened micro-screw method the patients can be divided into four groups: (1) a group without pathologic scotopization, which includes congenital protan defectives; (2) a group in which pathologic scotopization starts; (3) a group with evident pathologic scotopization, due to Stargardt's disease and other cone dystrophies; and (4) a group with complete pathologic scotopization, which includes the congenital achromats and the end-stages of the cone dystrophies.

This is a preview of subscription content, log in to check access.

References

  1. 1.

    Verriest G. Further studies on acquired deficiency of color discrimination. J Opt Soc Amer 1963; 53: 185–95.

  2. 2.

    Pinckers A, Marré M. Scotopization and the Nagel-II anomaloscope. Doc Ophthalmol 1991; 78: 279–83.

  3. 3.

    Marré M, Pinckers A. Influence of pathologic scotopization on the extended Rayleigh match. Doc Ophthalmol 1993 (submitted).

  4. 4.

    Pinckers A. Color vision and age. Ophthalmologica 1980; 181: 23–30.

  5. 5.

    Pinckers A. Clinical color vision examination. Doc Ophthalmol Proc Series 1984; 39: 171–79.

  6. 6.

    Linksz A. An essay on color vision. New York: Grune & Stratton, 1964.

  7. 7.

    Waaler GHM. Genetics and physiology of colour vision, III. Oslo: 1.Nat.-Naturv.Klasse.Avhandlinger.Ny Serie no. 15, 1975.

  8. 8.

    Moreland JD. The clinical utility of anomaloscopy. In: Ohta Y, ed. Color vision deficiencies. Amsterdam: Kugler & Ghedini, 1990: 127–43.

  9. 9.

    Marré M, Marrée E. Erworbene Störungen des Farbensehens. Diagnostik. Leipzig: VEB Georg Thieme, 1986.

  10. 10.

    Pinckers A, Marré M. Scotopization and pseudoprotanomaly in blue-yellow color vision defects. Acta Ophthalmol 1992; 70: 593–96.

  11. 11.

    Marré M, Marré E, Eckhardt T. Evaluation of the SPP-II test. In: Drum B. et al., eds. Colour vision deficiences, X. Dordrecht/Boston/London: Kluwer, 1991: 161–65.

Download references

Author information

Correspondence to A. Pinckers.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Pinckers, A. Pathologic scotopization: A shortened Nagel-II anomaloscopic micro-screw method. Doc Ophthalmol 85, 259–266 (1994). https://doi.org/10.1007/BF01664933

Download citation

Key words

  • Anomaloscope
  • Cone dysfunction
  • Colour vision
  • Pathologic scotopization
  • Stargardt