FUNDAMENTAL BASIS OF IRISDIAGNOSIS: PHENOMENA OF THE EDGE OF THE PUPIL (THE ‘NEURASTHENIC’ RING)

The margin of the pupil, pars iridica retinae, in its dilatation, colour, shape and plasticity, is a reflection of the central nervous system. One which is of delicate appearance, of reddish-brown colour and with a uniform edge, is to be regarded as normal. To enumerate the varieties of individual form and colour is beyond the scope of the present work.

Any signs in the corresponding sector of the iris should be interpreted in association with all phenomena affecting the margin of the pupil. As stated elsewhere, signs which displace or break through the iris-wreath refer to the vegetative nervous system. If such signs go out from the pupil or go through to reach the pupil, they refer to the central nervous system. Where signs relating to the organ areas extend to the pupillary margin, an edge-sign will be found. This sign differs in form and colour according to the nature of the disturbance.

One must always bear in mind that the eye represents a unity, and should be considered in its entirety. From this it follows that neither the edge of the pupil nor the peripheral margin of the iris alone can provide the basis for any diagnosis.

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