5i8 n/sf-ASFS 01' rur. rye 



A. (1) Anterior Polar or Pyramidal Cataract. 



ii is an opacity situaU-d ai llic anterior pole of the lens 

 beneath ihe capsule. It may be conp^enital or acquired. 



In the ac(|uired form, a corneal ulcer perf<jr'ates the cornea, 

 irritates the lens, producin},^ a proliferation of the sub- 

 capsular epithelium. Interference with vision is slight. 

 The treatment is usually nil. 



The anterior chamber is restored later. 



A. (2) Posterior Polar Cataract. 



Conm'u'lliil, I his is central and due to ilic remains of the 

 hvaloid arterv which ajijiears as a black dot upon the red 

 fundus reflex. 



Xo treatment is required. 



Acquired, this is cortical and stellate in shape. It develops 

 in connection with high myopia, choroiditis, diseases of 

 the vitreous and retinitis |>igmentosa. These remain 

 stationary for years and may become complete. Vision 

 is impaired and treatment useless. Deal with the 

 accom pa n y i n g condition. 

 A. (3) Lamellar or Zonular Cataract. 



These are congenital or infantile. They are most commonly 

 seen in children and usually alTect b<jth eyes, being 

 associated with rickets, a general disorder. 



It appears as a grey disc-like opacity surrounded or being 

 surrounded by a clear transparent portion of the pupil. 

 It is most dense at the margin of the disc. The visual 

 interference may be slight or severe. 



Iridectomy can always be done and the vision improved. 

 riif portion chosen for iridectomy should be downwards 

 and inwards. In ihc young discission can be practised, in 

 elder people extraction of th(» lens is done. 



A. (4) Unconinion Forms. 



.All congenital are .somewhat uncommon. 

 Interference with the \ision is slight. There mav be: — 

 a central while opacity in the lens; 

 a fusijorm, spindle-shaped opacity stretching from the 



anterior to the posterior pole, 

 a pituctalc cataract having numerous small white dots 

 distributed throughout the lens. 



B. (1) Senile Cataract. 



This is the most common form of cataract. 



Ik)th eyes are commonly affected, one following the otlier. 



