Hemangiomas typically grow within the choroids, the blood vessel layer beneath the retina. If they are located in the macula or they leak fluid, they can affect your vision. Many choroidal hemangiomas never grow or leak fluid and may be observed without treatment. These are not cancers and never metastasize.
Choroidal hemangioma is typically reddish to orange, but can have areas of increased pigmentation which can make them difficult to differentiate from choroidal melanomas. Choroidal hemangiomas can cause far-sightedness (hyperopia), distorted vision (metamorphopsia), flashing lights, or blurred vision. Many choroidal hemangioma cause no symptoms at all, and are found on routine dilated eye examinations (ophthalmoscopy).
