Fundus camera-based<unk>  techniques and scanning laser ophthalmoscope-based<unk>  techniques are there. The concentration of<unk><unk>  dye may vary according to instrument used. For fundus cameras, 25 ml<unk>  dissolved in 5 ml solvent is used, it may be increased to 50 ml in patients with poorly dilated pupil and high pigmentation. In case of iodine allergy, instead of<unk> , iodine-free dye Infracyanine<unk>  should be used. To perform test, pupil should be dilated. The dye is injected through the antecubital vein as bolus. Images are taken in several second intervals until the retinal and choroidal circulations are maximally hyperfluorescent. Then for first few minutes, take photos at approximately 30 to 60 second intervals. Pictures taken are classified under three phases: # Early phase at 60 seconds. # Mid phase at 5-15 minutes. # Late phase at 15-30 minutes
Indocyanine green angiography
Microangiography
Carbon dioxide angiography
Digital variance angiography
Intravascular imaging
Rotational angiography
Radionuclide angiography
Digital subtraction angiography