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
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


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.

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