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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 54, Iss. 3 — Mar. 1, 1964
  • pp: 368–374

Validation of an Indicator of Mammalian Retinal Receptor Response: Action Spectrum

JAY M. ENOCH  »View Author Affiliations


JOSA, Vol. 54, Issue 3, pp. 368-374 (1964)
http://dx.doi.org/10.1364/JOSA.54.000368


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Abstract

<p>An indicator of <i>individual</i> retinal receptor response in the mammal is sought. This indicator must represent a detectable physical or chemical change of state in the receptor induced by the transducer of the photoreceptor. A histochemical technique has recently been described which results in differential staining between light-adapted and dark-adapted receptors.</p><p>In this experiment an attempt has been made to identify the action spectrum of this reaction in the predominantly rod retina of the albino rat. The action spectrum of this differential staining effect approximates that of rhodopsin.</p><p>The staining takes place in the ellipsoid portion of the receptor (in the inner segment). From other investigations, however, rhodopsin is known to be localized in the outer segments of such cells.</p>

Citation
JAY M. ENOCH, "Validation of an Indicator of Mammalian Retinal Receptor Response: Action Spectrum," J. Opt. Soc. Am. 54, 368-374 (1964)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-54-3-368


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References

  1. J. M. Enoch, J. Opt. Soc. Am. 53, 71 (1963).
  2. J. M. Enoch, Invest. Ophthalmol. 2, 16 (1963).
  3. J. M. Enoch, "Physical Properties of the Retinal Receptor and Response of Retinal Receptors," Psych. Bull. (to be published).
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  13. The fact that the effect is obtained when the dissected retina is exposed to light in vitro also rules out the necessity of absorption of the energy by the choroid or the pigment epithelium for this reaction to occur. Repetition of this experiment in vitro would eliminate reflectance factors.
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  27. One may question the validity of plotting the absorption coefficient with the data describing log relative sensitivity (Fig. 6) since the absorption coefficient curves may be varied by changing the thickness of the absorbing layer (d) or by manipulating the concentration (r) of the absorbing material. (The values of d and r used by Margoliash are not given.) However, the author doubts that any such manipulation will provide a reasonable fit to the data presented in this experiment. The ellipsoid layer is only a few microns thick and the concentration of cytochromes cannot be very great.
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  30. In his article Dr. Cone briefly considers the role played by waveguide modal patterns in Dr. Dowling's preparations. One tacit assumption made by Dr. Cone in the treatment of these data is that no changes in modal pattern occur during near-total bleaching. One may inquire as to the effect of extensive bleaching of the rhodopsin upon the indexes of refraction and the configuration of the receptor cell, and the interstitial matrix, etc. Small differences in physical characteristics and absorption become important when one considers the receptor as a waveguide. One may ask also whether the conditions employed by Dr. Dowling in his experiment favored the simultaneous transmission of multiple waveguide modal patterns? These questions are not raised in criticism of Dr. Dowling's experiment, but rather are directed toward generalizations of Dr. Cone's interpretation.
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