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Persons who see rings around the lights should heed the danger signal and see an oculist. Retinitis may also be inherited. I have known of three generations becoming blind from this cause. Nearsightedness may also be inherited.
Choroiditis and retinitis may also occur, and leave permanent changes easily recognised on examination with the ophthalmoscope. Among the rarer and more serious lesions of the inherited disease may be mentioned gummatous disease in the larynx and trachea, attended with ulceration and resulting in stenosis; and lesions of the nervous system which may result in convulsions, paralysis, or dementia.
In retinitis pigmentosa the peripheral or extramacular portions of the retina are subject to a pigmentary degeneration that renders them insensitive to light, and patients so afflicted are consequently incapable of seeing at night as well as others. They stumble and run against objects easily seen by the normal eye.
That of an elderly patient with marked vascular disease, often renal involvement, and distinctly impaired nutrition. There may be renal retinitis or retinal hemorrhages. The case may easily become one of hemorrhagic glaucoma. It may run a very chronic course.
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