Scanning laser ophthalmoscope

ICG s primary use is as a fluorescent dye for retinal and choroidal angiography. Its low fluorescence property initially limited its use in angiography smdies. Improvements in video technology, the introduction of appropriate excitation and barrier filters, and the development of the scanning laser ophthalmoscope with a modification to permit infrared recording ultimately allowed choroidal angiograms with high temporal and spatial resolution. 

Medeiros EA, ZangwUl LM, Bowd C (2004) Comparison of the GDx VCC scanning laser polarimeter, HRT II confocal scanning laser ophthalmoscope, and strams OCT optical coherence tomograph for the detection of glancoma. Arch Ophthalmol 122 827-837. 

Indirect ophthalmoscopic assessment of the optic nerve head and retinal nerve fiber layer at the slit lamp should, whenever possible, be augmented by other techniques such as direct ophthalmoscopy, retinal photography, and/or scanning laser ophthalmoscopy. 

A laser scanning ophthalmoscope can relatively easily be combined with the TCSPC scanning technique (see Sect. 3.4, page 37). The fluorescence light from the retina is split off by a dichroic mirror and detected by a second PMT. The detection wavelength of the PMTs is selected by filters, FI and F2. The photon pulses from the fluorescence channel PMT are fed into the start input of the TCSPC module. The stop pulses come from the diode laser. 

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