Abstract
The increment threshold versus intensity (t.v.i.) curve for rods was studied using Stiles’ two color threshold technique at 10° temporal retina on two normal observers. The results show that the t.v.i. curves for rods for both observers were shallower than the t.v.i. curves for rods which Stiles (1939) (1) described. The possibility that the t.v.i. curve for rods may consist of two brances was suggested. In order to examine the results with the Field Additivity Law, the t.v.i. curve for rods for a 430 nm test on a 480 nm background, and bichromatic mixtures of fields of 480 nm and 598 nm were measured at 10° temporal retina. In this field mixture experiment, the increment threshold for rods obeyed the Field Additivity Law.
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References
. Stiles, W.S. The directional sensitivity of the retina and the spectral sensitivities of the rods and cones, Proc. Roy. Soc. (London), B127, 64 (1939).
. Kitahara, K., Tamaki, R., Noji, J., Kandatsu, K. and Matsuzaki, M. Extrafoveal Stiles’ mechanisms, Doc. Ophthalmol. Proc. Series 35: 397–403 (1982).
. Pugh, E., The nature of the π1 mechanism of W.S. Stiles, J. Physiol. 257: 713 (1976).
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© 1985 Dr. W. Junk Publishers, Dordrecht, The Netherlands
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Kitahara, K., Tamaki, R., Noji, J., Kandatsu, A., Matsuzaki, H. (1985). Increment Threshold Versus Intensity Curves for Rods. In: Heijl, A., Greve, E.L. (eds) Sixth International Visual Field Symposium. Documenta Ophthalmologica Proceedings Series, vol 42. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5512-7_39
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DOI: https://doi.org/10.1007/978-94-009-5512-7_39
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