Un nouveau modéle destinéa l'interprétation de l'effet stiles-crawford

Simon, Jacques

doi:10.1016/0042-6989(70)90096-9

Cited by 5 publications

(6 citation statements)

References 6 publications

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“…Although the theoretical assumption that inner-outer segment junction is a 'point' cannot be true, it might be a more acceptable approximation for small rods of inner segment diameter, di < 0-8 micron. (This is about half the value calculated from the original 'white' light Stiles-Crawford effect data by Simon (1970) in the validation of his theory).…”

Section: Discussionmentioning

confidence: 89%

“…Inverse rod directional sensitivity to violet light measured at the cornea is a frequent (Flamant & Stiles, 1948; Cabello & Stiles, 1950) but by no means invariable (Van Loo & Enoch, 1975) Fig. 5 the continuous line represents the best fitting curve according to Simon's (1970) theory (inner segment diameter, di = 1-03 micron). The dashed line in this Figure (and those in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Simon's (1970) hypothesis is a more satisfactory explanation for the wave-length variation in directional sensitivity of his rods (r.m.s. deviations = 3-42(10)-3) than is the supposition that po(/t) is a wave-lengthindependent constant [r.m.s.…”

Section: Discussionmentioning

confidence: 99%

“…Noting that diffraction at the photoreceptor base is an important consideration when its diameter is of the order of the wave-length of light, Simon (1970) hypothesized that a retinal cone is optically equivalent to the combination of a lens and a receptor point (inner segment-outer segment junction). This lens, at the base of the inner segment, focuses the exit pupil on the receptor point.…”

Section: Discussionmentioning

confidence: 99%

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The directional sensitivity of retinal rods.

Alpern¹,

Ching²,

Kono³

1983

The Journal of Physiology

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SUMMARY1. Rod field sensitivity, 10-S(r) (i.e. the reciprocal of the radiance of a background required for 10-fold elevation of rod threshold) was measured for monochromatic backgrounds traversing the pupil at various points (r) on three subjects. The wave-length dependency of the directional sensitivities of the three foveal cone mechanisms of the principal subject have been reported previously (Alpern & Kitahara, 1983).2. Rods, as cones, are less sensitive to obliquely incident, than to normally incident backgrounds. At the pupil margin (4 mm) the effect is between 0-368 and 0-976 log1o

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Section: Discussionmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The directional sensitivity of retinal rods.

Alpern¹,

Ching²,

Kono³

1983

The Journal of Physiology

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“…There is also an analogy between the HE, _, model and the model by Simon (1970). When the transmission function for the wide end of the inner segment in his model is given by the transverse E-field of the HE, ,, mode restricted to a circle with area S,, the intensity detected by the point receptor is proportional to the fraction of light P(0,,) guided by the outer segment in our HE,, , model.…”

Section: Discussionmentioning

confidence: 99%

The Stiles-Crawford colour change

1974

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Abstract-Toobtain the Stiles-Crawford colour change. the absorption of guided and unguided light by a cone outer segment as a function of the angle of incidence is estimated. The model is specified in two wals: the HE,,, model. based on a waveguide modal analysis. and the geometrical optics model, The measurements by Stiles (1937) are fitted with reasonable success. both for the intensity effect and for the colour change. using the phenomenon of selfscreening to explain the colour change.The Stiles-Crawford colour change has been explained in the literature as due to selfscreening of the visual pigment (Brindley. 1953: Walraven andBouman, 1960). Walraven and Bouman (1960) have obtained a specific expression for the absorption of light by the photopigment. attributing the Stiles-Crawford intensity effect to leakage from the outer segment and leakage from the inner segment. In this paper the Stiles-Crawford intensity effect is attributed to leakage from the inner segment. The expression for the absorption of light by the pigment in the outer segment. which will be used here. is specified in two ways. In the geometrical optics model the parameters. except the absorption coefficients. are not wavelength-dependent.In the HE, ,, model the parameters are obtained from the characteristics of the HE, .I dielectric waveguide mode. The Stiles-Crawford colour change is attributed to selfscreening.

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