1923. No. 23. 



A CASE OF CONGENITAL MIOSIS. 



TQ 



In two series of sections through the iris, cut for the purpose of studying 

 the periphery of the iris, one from a 40-year-old woman, and the other from 

 a man of 22, I have found conditions in the periphery of the iris which 

 are not at all unlike those in hg. 12. I have reproduced a drawing of them 

 in letterpress-figure 2. It will be seen that in the woman's eye the dilatator 

 ends in a club-shaped raised ridge, and this could be followed through 

 sections. In the man's eye (Letter-press fig. 3) I found no "club", but the 

 dilatator was pushed far out into the stroma in a somewhat outward direction. 

 In a section near that which is reproduced I found, in the dilatator in the 

 woman's eve, a condition that Klinge has found in animals, namelv, that the 



\^-j'';^^^^^ 



Letter-press fig. 3. 



Two consecutive sections of the periphery of the iris of a 22 years old man 



(depigmentation: hydrogenium dioxyd). 



dilatator bends round the iridian epithelium and follows it a little way 

 inwards and backwards in a direction up towards a ciliary process. 



From the few investigations of the periphery of the iris that I have 

 made, it seems to me that such swellings of the dilatator (shown in tig. 12) 

 are not of very rare occurrence, and they must be particularly well adapted 

 for "anchoring points" for the dilatator. But on this point too, our know- 

 ledge is not very great'. 



With regard to the question of the attachment of tlic dilatator, 

 Faber thinks (quoting Grunert and P'orsmarkI that the dilatator 

 begins at the ciliarv border of the iris with a number of bundles which 



' I have therefore begun to collect material, and intend to return to the question of the 

 periphery of the normal dilatator pupillæ in a future paper. 



