- A: represents that part of theiris covered by many blood vessels which hide the radial muscles underneath the surface. Contraction of these radial muscles causes the pupil to dilate.
- B: represents that area of the iris which contains many circular muscles, an indication of their presence being the 'distance lines' in this 'circle of correlation'. Contraction of thesecircular muscles causes the pupil to constrict.
- G: is a fine membrane which we encountered already as the 'circle of adaptation'.
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There are many lights/structures inside the pupil and it is important to ask ourselves what they could possibly be or we may run the risk ofassuming structures which do not really exist in this eye. D: is a candidate for such wrongidentification as many pigeon fanciers classified it as a 'cluster'. What bothered me aboutthis identification was that I noticed the same similar looking 'object' in a few pigeon eyes but:
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- One would not expect to find abnormalities at such high a rate and all looking so much alike, even though it can be seen in only a few images and only in images where the light is directed toward the pupil, never where the center of the light strikes the retina.
- The frequency with which these 'structures' are observed is proportional to the brightness of the light source and inversely proportional to the distance of thelight source to the eye.
