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FROM OUR Ophthalmic Imaging Center | ![]() |
Questions:
eyereplies@aol.com
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PHOTO TIP: In monochromatic photography, use a green filter and a red filter to visualize structures in the retina and choroid. |
Green and red electronic filters* | Monochromatic filters (RGB) |
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Color fundus photos OS reveal a greenish subretinal mass. Green filter (electronic channel) highlights the subretinal
mass, retinal vessels, and retinal layers.
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Typically, a cobalt blue filter demonstrates best the nerve fiber layers. The green filteroften called red-free filteroffers good contrast between the retinal layers, retinal vessels, and optic nerve head. The red filter allows documentation of the choroid and its vessels, usually seen as white vessels. | |
Red filter (electronic channel) reveals choroidal details; subretinal mass remains visible (subretinal blood blocks red light from reaching the choroid). |
* In Photoshop, press F2 and F3; alternatively, press Command 2 and Command 3 (Macintosh) |
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