Text-book of ophthalmology . lly in young people and without discoverable cause. It may or may not be associatedwith a slight papillitis. The visual disturbance is often moderate, and after a long timecomplete recovery may take place. Other cases are more acute in onset, being precededby violent pain in the eyes and head and accompanied by marked neuro-retinitis withgreat narrowing of the arteries. These cases are helped by salicylic acid. Other casesoccur with optic neuritis due to influenza, syphilis, or chlorosis; and a star figure inthe macula also accompanies some cases of choked disk due
Text-book of ophthalmology . lly in young people and without discoverable cause. It may or may not be associatedwith a slight papillitis. The visual disturbance is often moderate, and after a long timecomplete recovery may take place. Other cases are more acute in onset, being precededby violent pain in the eyes and head and accompanied by marked neuro-retinitis withgreat narrowing of the arteries. These cases are helped by salicylic acid. Other casesoccur with optic neuritis due to influenza, syphilis, or chlorosis; and a star figure inthe macula also accompanies some cases of choked disk due to brain tumor, meningitis,or hydrocephalus. Other cases, marked by sudden blindness or sector-like limitationsof the field are caused by circulatory disturbances (probably embolism) in the some occur in severe injuries of the skull, produced by blunt force (Leber).—D.][3. Retinitis Cachecticorum is a form, also more or less resembling albuminuricretinitis, occurring in carcinomatous subjects (Leber).—D.]. Fig. 253.—Diabetic Retinitis in a Man Sixty-nine Years of Age. When the diabetes was discovered eleven years previous six per cent of sugar was present, whilefor some years past, under the influence of suitable treatment, the sugar has almost disappeared. Thedisturbance of sight has lasted for nine months, and is caused mainly by a central scotoma for blue—a scotoma which corresponds to the exudate in the macula. In keeping with the myopia of the eyethere is an atrophic crescent, about half the width of the papilla, adjoining the optic nerve. In itsposteiior section the retina shows numerous punctate haemorrhages, which are generally disposed ingroups, and frequently coalesce to form rather large patches. In addition, small, brilliantly whitedots are present of irregular shape and sharp outline. These are disposed quite irregularly in a largecircle surrounding the macula. In the macula itself is found quite a large exudate having a structurelike that o
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