Topografía de la sumación espacial en el campo visual central

  1. Marta González Hernández
  2. Manuel Antonio González de la Rosa
  3. Alicia Cristina Pareja Ríos
  4. V. Lozano López
  5. Fátima Irene Mesa Lugo
Journal:
Archivos de la Sociedad Española de Oftalmologia

ISSN: 0365-6691

Year of publication: 2005

Volume: 80

Issue: 12

Pages: 719-724

Type: Article

DOI: 10.4321/s0365-66912005001200007 DIALNET GOOGLE SCHOLAR

Abstract

Purpose: Luminance (L) and area (A) of the stimulus are related by the equation LxAᵏ=constant. We evaluated the k value in 66 positions of the central visual field. Methods: Ten eyes of 10 healthy subjects were examined for conventional luminous thresholds at 66 positions of the central visual field with the TOP strategy using Goldmann sizes 4, 3.5, 3, 2.5 and 1.9 in the PULSAR perimeter. Results: The k value increased in a lineal manner from the centre towards the periphery (slope=0.01 per degree, average k=0.616, r=0.98, p<0.01) but with unequal slopes at the different meridians. In the inferior hemi-fields it was higher (k=0.657) than in the superior hemi-fields (k=0.574). The k value at the supero-nasal hemifields is quite similar to that found at the paracentral region, and maximum at the temporal inferior region. Conclusions: Spatial summation in the central visual field has specific values for different positions.

Bibliographic References

  • Goldmann, H. (1945). Grundlagen exakter Perimetrie. Ophthalmologica. 109. 57-70
  • Latham, K, Whitaker, D, Wild, JM. (1994). Spatial summation of the differential light threshold as a function of visual field location and age. Ophthalmic Physiol Opt. 14. 71-78
  • Gougnard, L. (1961). Étude des summations spatiales chez le sujet normal par la périmétrie statique. Ophthalmologica. 142. 469-486
  • Dannheim, F, Drance, SM. (1971). Studies of spatial summation of central retinal areas in normal people of all ages. Can J Ophthalmol. 6. 311-319
  • Verriest, G, Ortiz-Olmedo, A. (1969). Étude comparative du seuil différentiel de luminance et de l'exposant de sommation spatiale pour des objets pleins et pour des objets annulaires de mèmes surfaces. Vision Res. 9. 267-282
  • Fankhauser, F. (1979). Problems related to the design of automatic perimeters. Doc Ophthalmol. 47. 89-139
  • Gramer, E, Kontic, D, Krieglstein, GK. (1981). Die computerperimetrische Darstellung glaukomatoser Gesichtsfelddefekte in Abhangigkeit von der Stimulusgrosse. Ophthalmologica. 183. 162-167
  • Garway-Heath, DF, Caprioli, J, Fitzke, FW, Hitchings, RA. (2000). Scaling the hill of vision: the physiological relationship between light sensitivity and ganglion cell numbers. Invest Ophthalmol Vis Sci. 41. 1774-1782
  • Gonzalez de la Rosa, M, Martinez, A, Sánchez, M, Mesa, C, Cordoves, L, Losada, MJ. (1997). Perimetry Update 1996/1997. Kugler. Amsterdam.
  • Sloan, LL. (1961). Area and luminance of test object as variables in examination of the visual field by projection perimetry. Vision Res. 1. 121-138
  • Wilson, ME. (1970). Invariant features of spatial summation with changing locus in the visual field. J Physiol. 207. 611-622
  • Wood, JM, Wild, JM, Drasdo, N, Crews, SJ. (1986). Perimetric profiles and cortical representation. Ophthalmic Res. 18. 301-308
  • Kasai, N, Takahashi, G, Koyama, N, Kitahara, K. (1992). Perimetry Update 1992/1993. Kugler. Amsterdam.
  • Curcio, CA, Allen, KA. (1990). Topography of ganglion cells in human retina. J Comp Neurol. 300. 5-25
  • Danckert, J, Goodale, MA. (2001). Superior performance for visually guided pointing in the lower visual field. Exp Brain Res. 137. 303-308
  • Rovamo, J, Virsu, V. (1979). An estimation and application of the human cortical magnification factor. Exp Brain Res. 37. 495-510
  • Wild, JM, Wood, JM, Flanagan, JG. (1987). Spatial summation and the cortical magnification of perimetric profiles. Ophthalmologica. 195. 88-96
  • Fitzgibbon, T, Funke, K. (1994). Retinal ganglion cell axon diameter spectrum of the cat: mean axon diameter varies according to retinal position. Vis Neurosci. 11. 425-439
  • Muller, B, Peichl, L. (1993). Horizontal cells in the cone-dominated tree shrew retina: morphology, photoreceptor contacts, and topographical distribution. J Neurosci. 13. 3628-3646
  • Muller, B, Peichl, L. (1989). Topography of cones and rods in the tree shrew retina. J Comp Neurol. 282. 581-594
  • Curcio, CA, Sloan, KR, Kalina, RE, Hendrickson, AE. (1990). Human photoreceptor topography. J Comp Neurol. 292. 497-523