SOCIETY OF THE UNIVERSITY OF ABERDEEN. 



127 



size of pupil in hypermetropia than in myopia. Silberkuhl l also 

 states that his experience afforded denial of the statement that in 

 myopia the pupil is generally larger than in hypermetropia, but gives 

 no statistics. Schadow,- from his own observations, finds that the 

 refraction has no influence on the size of pupil, while Elbach of 

 Marburg states 3 that the pupil is not wider in myopia than in 

 hypermetropia. 



The following table shows the relation of the acuteness of vision, 

 without correction by lenses of the errors of refraction, to the size of 

 the pupil. Naturally one would expect the smaller pupil to have the 

 better vision as in it the diffusion circles are cut off. The students 

 are divided into three groups according to whether the pupil measured 

 from 3 to o mm., ;V5 to 7'5 mm. or 8 to 10 mm., and each of these is 

 subdivided into three as the vision is better than , between -* and rV, 

 and A- and less. 



From the above table it appears that the percentage of those 

 with vision better than and these formed the majority of the 

 students is greater in the groups with pupils from 3 to 5 mm. and 

 5 - 5 to 7 - 5 mm., than it is in the group with pupils from 8 to 10 mm. 

 in diameter. 



A striking point shown by this table is that those having the 

 largest pupils form a group which shows a considerably smaller 



1 Archiv fiir Ophthalmologie, 1896. 



- Ibid., 1882. 3 Ophthal. Review, 1902. 



