By J. L. C. Martin-Doyle (Auth.)
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D E S C E M E T ' S M E M B R A N E . — T h i s also is structureless. 5. E N D O T H E L I U M . — T h i s is a single layer of cells which is prolonged backwards t o c o v e r the pectinate ligament and on t o the iris. I t is o w i n g t o this continuity t h a t pathological processes in the deeper layers of the cornea tend t o spread and lead t o such complications as iritis, iridocyclitis, and e v e n choroiditis. Since the healthy cornea is completely avascular, its nutrition is carried out b y diffusion from the vascular arcades at the limbus.
T R E A T M E N T . — A s for h y p o p y o n , w i t h special emphasis on carbolization o f the ulcer. Saemisch's section is sometimes necessary in unresponsive cases. ULCERATIONS 33 3. P h l y c t e n u l a r U l c e r . — V e r y c o m m o n l y occurs as a g r e y nodule near the limbus. I t has already been g i v e n a detailed description under D I S E A S E S O F T H E C O N J U N C T I V A , but when phlyctenular disease affects the cornea the following clinical types can b e seen : — a.
I t consists o f a central o p a c i t y composed o f irregular striations and it tends t o i m p r o v e spontaneously, but m a y leave some degree o f permanent o p a c i t y . T R E A T M E N T . — L o c a l steroid t h e r a p y is w o r t h a trial. 3. D i s k i f o r m K e r a t i t i s . — T h i s is a central g r e y infiltration in the middle layers o f the corneal stroma. I t often has a ' target ' appearance w i t h a v e r y dense ' bull's-eye Sometimes i t is associated w i t h a small h y p o p y o n .