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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)
Use of green and red electronic filters in fundus photography
 Use of monochromatic filters in fundus photography

Color fundus photos OS reveal a greenish subretinal mass.

Green filter (electronic channel) highlights the subretinal mass, retinal vessels, and retinal layers.
   Typically, a cobalt blue filter demonstrates best the nerve fiber layers. The green filter—often called red-free filter—offers 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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