Telangiectasia is a rare condition where abnormal dilation of small blood vessels and capillaries occur.  Decreased vision may take place from secondary causes. Different forms of telangiectasia exist. One type appears unilaterally (in one eye) and another kind develops bilaterally (in both eyes). It may be acquired or present at birth (congenital).

In some types of teleangiectasia, laser treatment may be beneficial in restoring or preserving vision.
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