55 



blood vessels of the sclerotic are congested; this produces 

 a light red ring, or seam around the cornea (pericorneal in- 

 jection.) The cornea near its outer border exhibits a weak, 

 diffuse cloudiness, which soon extends over the entire cornea; 

 in the beginning this cloudiness is weakly marked and the 

 cornea appears as if it were glass with a thin layer of fat 

 spread over it. In the advancement of the disease the mid- 

 dle or principal layer of the cornea becomes affected, which 

 leads to intense, diffuse cloudiness and occasionally to vascu- 

 larization of the cornea; the latter is distinctly visible at its 

 border in a few days after the beginning of the attack. 

 Sometimes a pearl white opacity may appear at some spot 

 on the outer surface of the cornea. In the beginning the 

 slight cloudiness of the cornea does not prevent one from 

 viewing the iris, the lens and sometimes the vitreous humor 

 and the retina. The purulent or flakey exudate in the 

 aqueous humor and the excessive contraction (almost entire 



Fig. 17. 

 This cut represents the free border of the iris attached at points to 

 the capsule of the lens, producing an irregular, ragged outline of the 

 pupil and wrinkling of the iris. This may be observed after several 

 attacks in periodic opthalmia (modified from Armatage). 



obliteration) of the pupil hide from view all the internal 

 parts of the eye. The iris appears rough on its outer sur- 

 face, slightly glazed, lighter colored than normal; at times 

 it is covered with a grey exudate. The ciliary portion of 

 the iris is bulged forward and outward ; the movements of 

 the iris are slow and weak ; it is quite insensible to variations 

 in light, and the pupil does not expand in the dark. The 



