When the choroid, as opposed to the ciliary body and iris,becomes inflamed,the eye is not usually painful or red and the patient complains of severe blurring or loss of vision. If the focus of choroiditis remains peripheral, the disease might remain unnoticed, as is witnessed by the relatively frequent observation of isolated healed foci in the fundi of asymptomatic patients. Often, the inflammation spreads from choroid to retina and then to the vitreous. When this happens the vision becomes markedly blurred, even when the original focus is remote from the macula region. Alternatively, the inflammation might originate from the retina and spread to involve the choroid and vitreous subsequently. Choroiditis at the macula itself usually leads to permanent loss of central vision.
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